How would reducing low-growing plants from an area impact a population of tortoises with two varieties of neck extension ability: short and long distance?

A The variety of tortoises with the ability to extend their necks a long distance would go extinct.
B The proportion of tortoises with the ability to extend their necks a long distance would increase.
C The variety of tortoises that could only extend their necks a short distance would go extinct.
D The proportion of tortoises that could only extend their necks a short distance would increase.

C The variety of tortoises that could only extend their necks a short distance would go extinct.

Reducing low-growing plants from an area would likely decrease the amount of available food for tortoises, especially those with shorter necks that are unable to reach higher vegetation. As a result, the tortoises with longer necks would have an advantage in obtaining food and surviving, while the ones with shorter necks would struggle to survive and eventually go extinct.