Question

If a star is considered medium-sized, it is

a) about the size of our sun
b) about half the size of our sun
c) about twice the size of our sun
d) at least five times the size of our sun

Answer 1

It is considered to be about the size of our sun.
So A.

Answer 2

Now, if by medium-sized you mean average, then the answer is a). about the size of our sun