Why would Coin want the people to become unreasonable and wild? What could her motives be?

President Alma Coin was the president of District 13 and the leader of the Second Rebellion against the Capitol. While President Snow is still the antagonist of the series, she is the hidden but true main antagonist of Mockingjay.

Coin was first introduced when Katniss Everdeen met her in District 13. Although initially appearing to fully support the rebellion — and demonstrating considerable leadership abilities — Katniss later realized that for Coin the war was a means to an end; pitting the Capitol and the districts against each other to clear her own path to power, and she was willing to sacrifice almost anything or anyone to achieve her goals, including Katniss herself. After Katniss' sister Prim was killed in a bomb drop orchestrated by Coin, Katniss showed up at Snow's execution, seemingly to kill him, but shot and killed Coin instead.Explanation:

to kill him basically

The answer is B. cold-blooded