History occurs when some events besides the experimental treatment occur/s during the course of the study and this event influences the DV
which one is correct?
my answer is occur
History occurs when some events besides the experimental treatment occur/s during the course of the study and this event influences the DV. Your answer is right. The subject of the subordinate clause is the underlined noun phrase with plural "events" as head, so it follows that the verb should be the plural "occur".
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History occurs when some events besides the experimental treatment occur/s during the course of the study and this event influences the DV.
Your answer is right. The subject of the subordinate clause is the underlined noun phrase with plural "events" as head, so it follows that the verb should be the plural "occur".