Question

What evidence.......these acts? (is/are)

Answer 1

what evidence is these acts?

Answer 2

Answer:

The answer is what evidence are these acts? Here the object is evidence but the subject is plural (these acts) and that is why is has been placed instead of is.

Had it been a singular subject, we could place is safely as the verb. According to subject verb agreement the plural verb fits more here to retain the meaning.

Explanation: