In both situations there is a lack of resources which causes people to die. In the grammar test below, why option 3 is not correct? But if you want to say a reason for.
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This sentence should be read as follows: There's a lack of some. What causes coral bleaching ?
Is this the only factor that causes such tragedies?
What does cause coral bleaching ? If you simply want to say the person or thing that makes something happen, you say 'cause of'; In that form, the singular factor matches with the verb causes.
