The author mentions the fact that we rarely focus our eyes on mirrors (lines ... ...

The author mentions the fact that we rarely focus our eyes on mirrors (lines 39–40) primarily in order to
(A) contrast our capacity to perceive objects with our capacity to imagine objects
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT71 (Dec 2013): Reading Comprehension