15. John, Mark and Mathew planted petchay at the foot of the hill near their home. Durit
time, Mathew noticed that the petchay they are about to harvest are not that healthy than the season before. They remembered that there was flooding that happened few months before they planted. How did the flood affected their harvest?
A. The flood washed off the essential nutricnts in the soil.
B. The flood changed the soil from hilly to flat soil.
The flood made the soil turn to clay.
C. The flood made the soil turn to clay. ​