The correct answer is number 2. Because the verb enjoy requires a gerund form. You get gerund form when you add -ing to the infinitive of the verb. But gerund functions as a noun.
Answer: 2) Every day after work, Sam enjoys adding new visuals to his music videos, editing them for inconsistencies, adding multiple layers of shapes and colors, and testing them with a new projector he purchased for his cousin’s upcoming party.
Explanation: parallelism or parallel structure is a literary device that consists in the repetition of the grammatical structure of different words or phrases in a sentence or paragraph, in order to emphasize an idea or to create an impact in the audience. From the given options, the revision that most effectively corrects the incorrect use of parallel structure, is the corresponding to option 2, because it writes all the elements of the list with the same structure (using gerund: adding, editing, adding, testing).
