Substitute to Find the Value of the Expression $w$ Is Given by the Formula

Multiple Choice

Substitute to find the value of the expression.
-The area of a rectangle of length land width $w$ is given by the formula $A = l N$ . Ann's backyard is rectangular with a length of $34.5$ yards and a width of $13.0$ yards. Find the area of Ann's backyard.

A) $448.50 \mathrm { yd }$
B) $448.50 \mathrm { yd } ^ { 2 }$
C) $47.5 \mathrm { yd } ^ { 2 }$
D) $47.5 \mathrm { yd }$