A Rectangular Enclosure Must Have an Area of at Least $600 \mathrm { yd } ^ { 2 }$

Multiple Choice

A rectangular enclosure must have an area of at least $600 \mathrm { yd } ^ { 2 }$ . If 140 yd of fencing is to be used, and the width cannot exceed the length, within what limits must the width of the enclosure lie?

A) $35 \leq w \leq 60$
B) $0 \leq w \leq 10$
C) $10 \leq w \leq 60$
D) $10 \leq w \leq 35$