Sentence Correction

20. A prolific architect who worked from the turn of the century until the late 1950’s, Julia Morgan designed nearly 800 buildings in California, perhaps most notably William Randolph Hearst’s monumental estate at San Simeon.

(A) Julia Morgan designed nearly 800 buildings in California, perhaps most notably William Randolph Hearst’s monumental estate at San Simeon
(B) perhaps the most notable of the nearly 800 buildings in California designed by Julia Morgan was William Randolph Hearst’s monumental estate at San Simeon
(C) of the nearly 800 buildings in California designed by Julia Morgan, perhaps the most notable was William Randolph Hearst’s monumental estate at San Simeon
(D) nearly 800 buildings in California were designed by Julia Morgan, of which William Randolph Hearst’s monumental estate at San Simeon is perhaps the most notable
(E) William Randolph Hearst’s monumental estate at San Simeon is perhaps the most notable of the nearly 800 buildings in California designed by Julia Morgan

The answer is A. I chose E. Could someone explain why it's A? Thanks a lot.

This is a modifier problem. The modifying phrase A prolific architect who worked from the turn of the century until the late 1950’s, is modifying the noun Julia Morgan - who is described as the prolific architect.
Hence A is the correct option.

None of the other options modify the noun - Julia Morgan - and are hence incorrect.