Writing Question?

<p>Hi guys, I came across this question on one of the practice writing sections that I was doing.
It says that the answer is a because It is more concise although C s completely correct. I thought that passive voice as used in option A was not preferred on the SAT. Any help here? Thanks again.
9. The San Diego Zoo is operated by the not-for- profit organization The Zoological Society of San Diego, which was founded in 1916.
a. The San Diego Zoo is operated by the not-for-
profit organization The Zoological Society of
San Diego, which was founded in 1916.
b. The San Diego Zoo, which was founded in
1916, is operated by the not-for-profit organi-
zation The Zoological Society of San Diego.
c. The Zoological Society of San Diego, which
was founded in 1916, is the not-for-profit
organization that operates the San Diego Zoo.
d. The Zoological Society of San Diego is a not-
for-profit organization that operates the San
Diego Zoo, which was founded in 1916.
e. The San Diego Zoo, founded in 1916, is oper-
ated by The Zoological Society of San Diego, a not-for-profit organization.</p>