Examine (a), (b), and (c) to find the best answer:
a) a circle with a radius of
b) a circle with a radius of
c) a circle with an area of
(b) is equivalent to (c) but not (a)
(a) is equivalent to (c) but not (b)
(a), (b), and (c) are all not equivalent
(a), (b), and (c) are all equivalent