C, because "butterfly chaser" seems to point to his opinions on nature.
The Library of Congress is one of the biggest database of publications of a wide array of subjects and courses existing in the world. It is a useful site because of the statement found in option B. it has become one of the most credible and trusted sites which scientists depend.
For your first question its A
for the 2 question its A
3 answer is c
4 answer is A
