Add or Subtract $3 \sqrt[3]{\mathrm{a}}+\sqrt[3]{27 \mathrm{a}}$ A) $4 \sqrt[3]{27 a}$ B) $3 \sqrt[3]{a}+\sqrt[3]{27 a}$

Multiple Choice

Add or subtract. Assume all variables represent nonnegative real numbers.

- $3 \sqrt[3]{\mathrm{a}}+\sqrt[3]{27 \mathrm{a}}$

A) $4 \sqrt[3]{27 a}$
B) $3 \sqrt[3]{a}+\sqrt[3]{27 a}$
C) $9 \sqrt[3]{\mathrm{a}}$
D) $6 \sqrt[3]{\mathrm{a}}$