Answer:
The answer choices are...
A.) I felt sick after I watched the documentary about roller coasters.
B.) Some people enjoy chicken more than turkey.
C.) The best time to visit Wyoming is in August.
D.) During the trip, I didn’t have a headache.
To me the correct answer is C.) The best time to visit Wyoming is in August.
Explanation:
The reason I say this is because the other ones don't state any opinions except for the letter C. Another reason I say this is because maybe some likes to visit Wyoming in December more than August so therefor this sentence states an opinion.