Turkey tried to destroy the kurdish citizens’ culture in order to a. erase their unique identity. c. take over their lands. b. force them to integrate into turkish society. d. both a and b.

Turkey already controls the lands of the Kurdish people - at least the Kurdish people on its territory - so this answer is definitely wrong.
Turkey wants the Kurdish population to be integrated into the Turkish county and culture- so they both try to a. erase their unique identity and 
b. force them to integrate into Turkish society.  - so the answer is D)