John realized that his orchard has been invaded by certain harmful invasive plants. These plants are consuming all the soil nutrients and water, and they are outcompeting native plants. John decided to cover the invasive plants with black plastic for one growing season. Which method did John use to control the invasive species?
A.
girdling
B.
mowing
C.
digging
D.
smothering
E.
tilling

Question

John realized that his orchard has been invaded by certain harmful invasive plants. These plants are consuming all the soil nutrients and water, and they are outcompeting native plants. John decided to cover the invasive plants with black plastic for one growing season. Which method did John use to control the invasive species?
A. 
girdling
B. 
mowing
C. 
digging
D. 
smothering
E. 
tilling

Vocaloid · Answer

any attempts to look any of these terms up? I can at least eliminate B+C