16 \( \times \)4a =1

16 \( \times \)4^a=1

A 2

B - 2

C 4

D - 4

Correct Answer: Option B

16\( \times \)4^a =1 or 2⁴\( \times \)2^2a =1 or 2^4+2a =1 or 2^4+2a =2⁰ or 4+2a = 0 or 2a = -4 so a = -2