20 POINTS PLEASE HELP!!!!!!

The local park has enclosed an area to make a playground. They need to buy mulch to spread over the entire area. How much mulch should they buy. Round to the nearest whole number.
A) 3 square units
B) 9 square units
C) 19 square units
D) 28 square units

20 POINTS PLEASE HELP The local park has enclosed an area to make a playground They need to buy mulch to spread over the entire area How much mulch should they class=