If 6^k = 4, then 6^(2k+3) =	Choose the correct choice from the following choices.
A) 2925 B) 3456 C) 4581 D) 3683 E) 1308

Rationale: 6 ^ k = 4 6 ^ 2 k = 4 ^ 2 6 ^ 2 k = 16 6 ^ ( 2 k + 3 ) = 6 ^ 2 k * 6 ^ 3 = 16 * 216 = 3456 answer : b
Answer: B