Answer:
Option B. 3 bags
Explanation:
step 1
Find the area of the flower bed
The area of the flower bed is the area of a triangle
A=(1/2)bh=(1/2)(20)(6)=60 m^2
step 2
Divide the area by 20 square meters to find the number of bags of topsoil
(60)/(20)=3 bags