Which of the following sentences is parallel? a. everyone not only passed but also is getting an a. b. she not only cooked ham but also made a pie. c. she likes to read books or listening to music. d. he likes reading, hunting, and to play basketball.

Option c. she likes to read books or listening to music

Parallelism is the use of components in a sentence that are grammatically the same or similar to their construction, sound, meaning or meter.  It adds balance and rhythm to sentences giving ideas a smoother flow and can be persuasive of the repetition it employs. Repetition of phrase gives the sentence a balance but rhythm and flow as well. It can also occur in similar structured clauses. 

Ifound this on google “use commas to separate two or more coordinate adjectives that describe the same noun. be sure never to add an extra comma between the final adjective and the noun itself or to use commas with non-coordinate adjectives.” i hope this you for what your looking for