If N = 2^0.20 and N^b = 16, b must equal  Choose the most appropriate option:
A) 3 / 80  B) 3 / 5  C) 20  D) 5 / 3  E) 80 / 3

Rationale: "20 / 100 = 1 / 5 n = 2 ^ 1 / 5 n ^ b = 2 ^ 4 ( 2 ^ 1 / 5 ) ^ b = 2 ^ 4 b = 20 answer : c"
Answer: C