Read this sentence: "Sophia is five, therefore she sits in a time-out for five minutes." One punctuation change would repair it. Which one?

1. "Sophia is five" and "she sits in a time-out for five minutes" are both complete statements. 2. "Therefore" is a connecting adverb, not a joining word like "and" or "so," so a comma alone cannot hold the two statements together. 3. The repair is a semicolon before "therefore," which gives each statement a full-strength break, option A. 4. Option B adds an end comma that fixes nothing about the join in the middle. 5. Option C removes the only separator and fuses the two statements even more tightly. 6. Option D splits a number off with a question mark and turns the meaning into nonsense. _Source: OpenStax Psychology 1e (CC BY 4.0), Ch 6 "Learning", section 6.3 Operant Conditioning_