Answer:
D. Cheryl's favorite snack is chocolate; she could eat it daily.
Step-by-step explanation:
A semicolon in option D is used to separate two independent sentences. If any other punctuation mark was used, it would be an incorrect sentence.
A is incorrect because there shouldn't be any punctuation mark there.
B is incorrect because a comma should be used instead of a semicolon.
C is incorrect because a colon should be used instead of a semicolon.