191. By studying the primitive visual systems of single-cell aquatic organisms, biophysicists have discovered a striking similarity between algae and cows, a similarity that indicates the common evolutionary origin of plants and animals: both algae and cows produce a light-sensitive protein called rhodopsin.
(A) biophysicists have discovered a striking similarity between algae and cows
(B) a striking similarity between algae and cows has been discovered by biophysicists
(C) there is a striking similarity that biophysicists have discovered between algae and cows
(D) the discovery of a striking similarity between algae and cows was made by biophysicists
(E) algae and cows have a striking similarity that was discovered by biophysicists

Solution:

Modifier*

A subject is needed after the comma.
Only A provides a logical subject after the comma.
Hence, A is the best choice.

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