Final answer:
The correct answer is option C: Gramma Tala doesn't think recess is long enough. She hopes the principal adds another fifteen minutes.
Step-by-step explanation:
The correct answer is option C: Gramma Tala doesn't think recess is long enough. She hopes the principal adds another fifteen minutes.
Option A is incorrect because it separates the two statements with a comma instead of a period or semicolon. Option B is incorrect because it uses a semicolon instead of a period or comma. Option D is incorrect because it does not use any punctuation to separate the two statements.
Therefore, option C is the correct choice as it fixes the punctuation and capitalization errors.