Direction: In these questions, sentences are given with blanks to be filled in with an appropriate word(s). Four alternatives are suggested for each question. Choose the correct alternative out of the four alternatives.
Our ancestors had immense difficulty ________ procuring books.

Options

A. 1) for
B. 2) of
C. 3) in
D. 4) on

Answer

C

Explanation

Here, in (Prep.) is the right usage