Answer:
As shown in picture, the amount of dirt:
A = 11 x 14.5 x 4 = 638 (m3)
The capability of the truck:
C = 2 x 3 x 5 = 30 (m3)
=> The required level truck loads is calculated by:
L = A/C = 638/30 = 21.27
=> Option C is correct
Hope this helps!
:)