[ Vocabulary ]
To spread harmfully, undesirably, and prolifically
A. Culprit
B. Invasive
C. Catastrophe
D. Benign
Select your answer:

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Correct the following text by inserting one comma.
We could add a solar heating system to the greenhouse or we could build a rainwater collection system for the same cost.
A. Place a comma after the word “could.”
B. Place a comma after the word “or.”
C. Place a comma after the word “greenhouse.”
D. Place a comma after the word “system.”
