Question

I dont know how to do this i need help quickly

Answer 1

$\dfrac{cd^4}{c^2 d^8}\\\\=c^{1-2} \cdot d^{4-8}\\\\=c^{-1} \cdot d^{-4}\\\\=\dfrac 1{c d^4}$

$\text{Hence the answer is C.}$