Final answer:
The sentence that is not parallel is option c) My favorite activities on Friday nights were dinner and going to a movie.
Step-by-step explanation:
The sentence that is not parallel is option c)My favorite activities on Friday nights were dinner and going to a movie. The reason it is not parallel is because the first activity, 'dinner', is a noun, while the second activity, 'going to a movie', is a gerund phrase. To make it parallel, both activities should be in the same form, either as nouns or as gerunds.