The Przewalski’s horse became endangered during the middle of the last century when the species experienced a population bottleneck, the result of human activity. Loss of habitat and human’s hunting them for food. What is a consequence of this type of genetic drift.
 A. 
 Use and disuse
 B. 
 Acquired variation
 C. 
 Increase of genetic diversity
 D. 
 Decrease of genetic diversity