Solve the Problem $2 \frac{1}{2}$ -Ft Fence Post Casts a 1 -

Multiple Choice

Solve the problem.
-When a $2 \frac{1}{2}$ -ft fence post casts a 1 - $\mathrm{ft}$ shadow, how long is the shadow cast by a $10-\mathrm{ft}$ tree?

A) $4 \frac{1}{2} \mathrm{ft}$
B) $5 \frac{1}{4} \mathrm{ft}$
C) $4 \mathrm{ft}$
D) $5 \mathrm{ft}$