If N = 2^0.3 and N^b = 16, b must equal  Choose the most appropriate option:
A) 3 / 80 B) 3 / 5 C) 4 D) 5 / 3 E) 40 / 3

Rationale: "30 / 100 = 3 / 10 n = 2 ^ 3 / 10 n ^ b = 2 ^ 4 ( 2 ^ 3 / 10 ) ^ b = 2 ^ 4 b = 40 / 3 answer : e"
Answer: E