It is necessary because if you don't have a confirmed opinion with textual evidence to back it up you wont have a good argument.
Answer:
B: Replace the comma between limited and specifically with a semicolon.
Explanation:
We should replace the <em>comma</em> with a <em>semicolon</em> between the words <em>limited</em> and <em>specifically</em> 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 <em>adverb</em> indicating some link to the first clause, <em>but</em><em> without a coordinating conjunction </em><em>and therefore</em><em>, a semicolon is necessary.</em>
