c. because answer A is irrelevant because the piece of evidence is about how to count not about rocks. Answer B is also irrelevant because there is no proof that wind-wolf was forced to work instead of helping out. answer D has nothing to do with any of it because the evidence is about counting not that he is unhappy or wants to learn differently.
B.Explains why the paper is written.
Hope this helps(this statement is overused)
The correct answer is A. When the subject of a sentence is singular, add "_s" to the base form.
An easy example is "to exist", the base form is "exist" and A strawberry exists shows that you add s when a singular subject is used.
B. The court shifted from sayin legal segregation did not cause social problems to saying it did
