one more

[CITI29]

As the etched lines on computer memory chips have
become thinner and the chips’ circuits more complex,
both the power of the chips and the electronic devices
they drive have vastly increased.

(A) the chips’ circuits more complex, both the power
of the chips and the electronic devices they drive
have
(B) the chips’ circuits more complex, the power of
both the chips and the electronic devices they
drive has
(C) the chips’ circuits are more complex, both the
power of the chips and the electronic devices
they drive has
(D) their circuits are more complex, the power of
both the chips and the electronic devices they
drive have
(E) their circuits more complex, both the power of
the chips and the electronic devices they drive
have

ans is 'b'... can someone pls explain?

[arunmmw]

A - "both the" should follow "and the"
C- "has" is singular.
d- is illogical
e- "their" isnt clear

[perfectstranger]

(A) the chips’ circuits more complex, both the power of the chips and the electronic devices they drive have –paralelism should be maintained both X and Y here both the power of chips and ‘’the power of ‘’ electronic devices so ‘’the power of’’ is needed after ‘’and’’-
(B) the chips’ circuits more complex, the power of both the chips and the electronic devices they drive has –correctly maintained parallelism the power (of both X and Y they drive)has vastly increased-
(C) the chips’ circuits are more complex, both the power of the chips and the electronic devices they drive has –paralelism should be maintained both X and Y here both the power of chips and ‘’the power of ‘’ electronic devices so ‘’the power of’’ is needed after ‘’and’’-
(D) their circuits are more complex, the power of both the chips and the electronic devices they drive have- have is wrong here since ‘’the power ‘’ is singular we need ‘’has’’ there is vague here it may refers to the chips or lines .Not clear.-
(E) their circuits more complex, both the power of the chips and the electronic devices they drive have–paralelism should be maintained both X and Y here both the power of chips and ‘’the power of ‘’ electronic devices so ‘’the power of’’ is needed after ‘’and’’-