Before the Industrial Revolution in the seventeenth century, sources of power were limited, specifically, humans relied on themselves, animals, wind, and water.
Leave as is.
Replace the comma between limited and specifically with a semicolon.
Replace the comma after century with a semicolon.

Answer :

Answer:

B: Replace the comma between limited and specifically with a semicolon.

Explanation:

 We should replace the comma  with a semicolon  between the words limited and specifically  because there are two independent clauses with thoughts related to each other; in this case, we cannot use a comma. Also, the word specifically  is an adverb  indicating some link to the first clause, but without a coordinating conjunction and therefore, a semicolon is necessary.

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