GAUSS7 2018 Problem 4

A square has an area of 144 \mathrm{~cm}^{2}. The side length of the square is

Answer Choices
A. 288 \mathrm{~cm}
B. 72 \mathrm{~cm}
C. 48 \mathrm{~cm}
D. 12 \mathrm{~cm}
E. 36 \mathrm{~cm}