GMAT PREP_Exam Pack I:Experts Please help !

The most widely known images of Yosemite National Park are those made by photographer Ansel Adams, who photographed it continually from his teenage years on.

a) who photographed it continually from his teenage years on
b) who photographed it starting from his teenage years and then continually
c) who photographed it starting in his teenage years and continually from then on
d) having photographed it continually since his teenage years
e) having photographed it starting in his teenage years and then continually

B: starting...and then continually
C: starting...and continually
A conjunction such as and must connect PARALLEL FORMS.
In B and C, starting (adjective) and continually (adverb) are not parallel forms.
Eliminate B and C.

A COMMA + VERBing modifier serves to express an action attributed to the SUBJECT OF THE PRECEDING CLAUSE.
In D and E, having photographed seems to refer to images -- the subject of the preceding clause -- implying that the IMAGES photographed Yosemite National Park.
Not the intended meaning.
Eliminate D and E.

The correct answer is A.

You're impressive sir!

GMATGuruNY wrote:

The most widely known images of Yosemite National Park are those made by photographer Ansel Adams, who photographed it continually from his teenage years on.

a) who photographed it continually from his teenage years on
b) who photographed it starting from his teenage years and then continually
c) who photographed it starting in his teenage years and continually from then on
d) having photographed it continually since his teenage years
e) having photographed it starting in his teenage years and then continually

B: starting...and then continually
C: starting...and continually
A conjunction such as and must connect PARALLEL FORMS.
In B and C, starting (adjective) and continually (adverb) are not parallel forms.
Eliminate B and C.

A COMMA + VERBing modifier serves to express an action attributed to the SUBJECT OF THE PRECEDING CLAUSE.
In D and E, having photographed seems to refer to images -- the subject of the preceding clause -- implying that the IMAGES photographed Yosemite National Park.
Not the intended meaning.
Eliminate D and E.

The correct answer is A.

GMATGuruNY wrote: B: starting...and then continually
C: starting...and continually
A conjunction such as and must connect PARALLEL FORMS.
In B and C, starting (adjective) and continually (adverb) are not parallel forms.
Eliminate B and C.

GMATGuruNY,
thanks for the detailed explanation. you're great! I have a few questions about the usage of the ING forms in B and C.

1) I would like to know if in choice B the phrase 'starting from his teenage years' can function as an ADVERB modifying 'photographed' had the choice been "who photographed it starting from his teenage years". Would this be correct?
From my understanding, an -ING form after a noun ('it' here) can only restrictively modify (defining modifier) the noun.
2) Also, my understanding is that the usage "who photographed it, starting from his teenage years" would be wrong as well because 'photographing' and 'starting from teenage years' are neither contemporaneous actions nor the second action is the result of the first.
Please confirm if my understanding is right.