I thinks it's B but C can also be an answer but I would go with B
The answer is letter D. the object of the sentence.
Since "a frog" is the recipient of the subjects action, it is considered the object of the sentence.
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Overall, this sentence seems correct to me.
The novel to kill a mockingbird came at a crucial time in american history in which (segregation) and (racism) were fueling debates across the country.
Hii I’m pretty sure it’s ‘Will not be’ sorry if it’s wrong