Which number is the smallest?

Question

Responses
A 1.28 x 1.28 x 10^ -4
B 2.85 x 2.85 x 10^ -6
C 3.24 x 3.24 x 10^ -5
D 4.68 x 4.68 x 10^ -4
E 5.48 x 10^-8

Answer 1

E 5.48 x 10^-8