Question

read the excerpt from dr. martin luther kings \letter from birmingham jail.\
if i sought to answer all the criticisms that cross my desk, my secretaries would have little time for anything other than such correspondence in the course of the day, and i would have no time for constructive work. but since i feel that you are men of genuine good will and that your criticisms are sincerely set forth, i want to try to answer your statement in what i hope will be patient and reasonable terms.
what is the author’s purpose for including these sentences?
to describe the productivity of his daily routine
to emphasize the significance of his critics’ letter
to establish the impressive credentials of his staff
to explain the nature of his profession

Explanation:

The author states he usually can't answer all criticisms due to time constraints but will answer the critics' statement because he sees their good will. This shows the critics’ letter is significant enough for him to make time. Other options are incorrect: the sentences aren't about daily routine productivity, staff credentials, or his profession's nature.

Answer:

B. to emphasize the significance of his critics’ letter