Solve the Problem $20 \mathrm{ft}^{2}$ To Adhere to Zoning Laws $10 \mathrm{ft}$

Multiple Choice

Solve the problem.
-A shop keeper is making a triangular sign for his store front, but he must keep the sign under $20 \mathrm{ft}^{2}$ to adhere to zoning laws. If the base of the sign is $10 \mathrm{ft}$ , what is the maximum height of the triangular sign?

A) $4.0 \mathrm{ft}$
B) $1.000 \mathrm{ft}$
C) $2.00 \mathrm{ft}$
D) $30 \mathrm{ft}$