For which of the following values of a, b, and c does the qu...

Question

For which of the following values of a, b, and c does the quadratic equation have two distinct real roots?

A

a = 1, b = 2, c = 1

B

a = 1, b = -4, c = 4

C

a = 1, b = 5, c = 6

D

a = 1, b = 1, c = 1