Sentence Correction

With cloning technology, scientists are approaching what has long been the ultimate goal of modern husbandry: achieving a consistency of quality and production in farm animals as once thought to be limited to manufactured goods.
(A) achieving a consistency of quality and production in farm animals as once thought to be
(B) achieving farm animals with a consistency of quality and production as were once thought of as
(C) achieving in farm animals a consistency of quality and production that was once thought to be
(D) achievement of farm animals whose consistency of quality and production are the same as what were once thought to he
(E) achievement of farm animals at a consistency of quality and production once thought of as 23

OA IS C PLS CAN U EXPLAIN

The Immigration Service now has the discretionary power to keep families united even though all their members do not meet the five-year residency requirement.
(A) all their members do not meet the five-year residency requirement
(B) not all their members meet the five-year residency requirement
(C) all their members have not met the requirement for a five-year residency
(D) not all their members have resided for five years, a requirement
(E) all their members have not resided for five years, as required

OA IS B PLS CAN U EXPLAIN

pls can somebody explain in detail

In First Question

D/E incorrect, because "achievement OF..." wrong construction
B - "as WERE once thought..." wrong construction
A - "acheiving" is incorrectly modifying "consistency and production" instead of modifying "animals".

COrrect B - "acheiving in farm animals...consistency of quality and production..."

acheiving correctly modifies "farm animals"

In second question,

B seems best option

nitin86 wrote:In First Question

D/E incorrect, because "achievement OF..." wrong construction
B - "as WERE once thought..." wrong construction
A - "acheiving" is incorrectly modifying "consistency and production" instead of modifying "animals".

COrrect B - "acheiving in farm animals...consistency of quality and production..."

acheiving correctly modifies "farm animals"

In second question,

B seems best option

For the first question "as" is not correct. it changes the meaning.
"that is necessary to create a sub clause