Although presents a contrast, and the sentence after comma presents that two paid sufficient attention still
so first blank can be something around “decreased”, some negative connotation wrt to the second sentence
initial fascination → __ after a few months
only d) seems the option
revived doesn’t presents a contrast with the two paid sufficient attention
emerged same reason as a)
intenstified, persisted doesn’t presents a contrast
so chose d
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Yes, that is correct. Flagged is the only word that signifies a decrease in their initial fascination.