Turkey tried to destroy its citizens’ culture.
a. shiite
c. kurdish
b. sunni

The best answer is c, for a number of reasons

first, Shiite and Sunni are not cultures, they're sects in a religion.

Then,  Most Turkish people are Sunni, so it can't be b. But it's also not Shiite: almost 25 % of Turkish people are Shiite!

the Kurds however speak a different language, and the mainstream Turkish culture sees it as a threat.