There is no objectively correct punctuation

Inspired by French illusionist George Méliés, he established the basic principles of editing, the joining together of bits of film shot in different places and at different times to form a single, unified narrative:

a) Eadweard Muybridge; b) Edwin Porter; c) D.W. Griffith; d) Louis B. Mayer; e) Mack Sennett

Which of the following is an example of psychological noise in a classroom setting?

a. someone coughing next to you b. worrying about your grade on a test c. experiencing hearing loss d. being confused by the meaning of a word