Solve the Problem $L$ , If the Width Is Fixed $20 \mathrm {~cm}$

Multiple Choice

Solve the problem.
-The graph shows the relationship between the area A of a rectangle and the length $L$ , if the width is fixed. Find the area if the length is $20 \mathrm {~cm}$ .

A) $180 \mathrm {~cm} ^ { 2 }$
B) $170 \mathrm {~cm} ^ { 2 }$
C) $220 \mathrm {~cm} ^ { 2 }$
D) $200 \mathrm {~cm} ^ { 2 }$