Question

choose the best punctuation mark to fill in the blank.
luna emphatically stated that she enjoyed only three musical genres blues, jazz, and country.

Explanation:

The sentence is introducing a list of three musical genres after the word "genres". The correct punctuation mark to signal the start of a list in this context is a colon. It separates the introductory clause from the specific items being listed.

Answer:

: (colon)