[I choose a.]

Question

How did the CITIES treaty reduce the slaughter of elephants?
a.it offered a bounty to tribal leaders for identifying poachers
b.it banned imports and exports of all ivory worldwide
c.it limited sales of ivory to the antique market.
d.both (a) and (b)

You are referint to the CITES treaty, not the CITIES treaty. It stands for Convention on International Trade in Endangered Species. Your answer is incorrect. Do a search with the proper treat name and you will find the correct answer.

c?