If p: all birds fly. what is ~ p?

a. some birds fly

b. birds always walk

c. not all birds fly

d. none of the above

C. not all birds fly.
When using _:_, you are contrasting two things so, you are putting a argument to go against the other side.
Not all birds can fly is going against All birds can fly.

Hope this helps. :)

Multiplication property of zero