Use the Rules of Exponents to Simplify the Expression $3 \mathrm{k}^{1 / 8}\left(-4 \mathrm{k}^{3 / 8}+6 \mathrm{k}^{3 / 4}\right)$

Multiple Choice

Use the rules of exponents to simplify the expression. Write the answer with positive exponents. Assume that all variables represent positive real numbers.
- $3 \mathrm{k}^{1 / 8}\left(-4 \mathrm{k}^{3 / 8}+6 \mathrm{k}^{3 / 4}\right)$

A) $-12 k^{3 / 64}+18 k^{3 / 32}$

B) $-12 \mathrm{k}^{-1 / 4}-18 \mathrm{k}^{-5 / 8}$

C) $-12 \mathrm{k}^{1 / 2}+18 \mathrm{k}^{7 / 8}$

D) $-12 \mathrm{k}^{1 / 2}-18 \mathrm{k}^{7 / 8}$