Question

fix any punctuation or capitalization errors below. click \submit answer\ if there are none.
i finally convinced black widow to try oreos with peanut butter she, however, still prefers to eat them plain.

Explanation:

The two independent clauses ("I finally convinced Black Widow to try Oreos with peanut butter" and "she, however, still prefers to eat them plain") are connected with the conjunctive adverb "however", so a semicolon should be used before the conjunctive adverb to properly link the two complete thoughts, replacing the comma after "butter". The commas around "however" are already correct as they set off the parenthetical adverb.

Answer:

I finally convinced Black Widow to try Oreos with peanut butter; she, however, still prefers to eat them plain.