Correct Option: D

Given that 16 x 8^{n + 2} = 2^m

Apply the law of Fractional Exponents and Laws of Exponents
if a multiply three times a x a x a then
a x a x a = a³
if a multiply two times a x a then
a x a = a²
if a multiply n times a x a x a x....up to n times, then
a x a x a x a ......up to n times = aⁿ
⇒ (2)⁴ x 2^{3 x (n+2)} = 2^m
⇒ (2)⁴ x 2³ⁿ⁺⁶ = 2^m
a^maⁿ = a^m+n
⇒ (2)^{(4 + 3n + 6)} = 2^m
⇒ (2)^{(3n + 10)} = 2^m
if p^X = p^Y then X will be equal to Y. means X = Y;
On comparing, we get
3n + 10 = m
⇒ m = 3n + 10;