[I choose a.]

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?

I apologize for the mistake in the previous message. However, even after conducting a search, I couldn't find any specific information about a treaty called the "CITIES treaty" related to the conservation of elephants. It is possible that there is a typo or incorrect information in the question.

However, if you are referring to the CITES treaty (Convention on International Trade in Endangered Species), then the correct answer would be:

b. It banned imports and exports of all ivory worldwide.

The CITES treaty was established in 1973 and is an international agreement aimed at protecting endangered species and controlling their international trade. One notable provision of the treaty is the ban on international trade of ivory, including imports and exports. This ban was put in place to combat the rampant poaching and illegal trade of elephant ivory, which was driving their populations to the brink of extinction.

By prohibiting the international trade of ivory, the CITES treaty aims to reduce the demand for ivory products, thereby decreasing the incentives for poaching and the slaughter of elephants. It attempts to create stricter regulations and controls on the trade in order to protect these vulnerable species.