Read these sentences.By late summer 1793, the yellow fever epidemic had taken hold of Philadelphia. _____ Henry Knox feared catching the fever if he remained there, he fled to Manhattan Island.Which transition word best connects the ideas?

The second sentence explains why Henry Knox fled Philadelphia: he feared catching yellow fever. “Because” introduces that reason: “Because Henry Knox feared catching the fever if he remained there, he fled to Manhattan Island.” “Therefore” would suggest a result but does not fit the sentence structure as naturally here.

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