Identify the sentence that uses incorrect parallel structure
a. mom is watching tv in the living room, and dad is mowing the backyard
b. concerned citizen can write letters, show up at the polls, and will be wearing pins that say, “honestly now.”
c. i usually like to unwind with a book or fall asleep in my beach chair.
d. strengthens core muscles, icing regularly, and visiting the chiropractor can all reduce back pain

B. Concerned citizens can write letters, show up at the polls, and will be wearing pins that say, "Honesty Now."

there is 2 main differences, basically which are the users and the market. the other difference is the kind of content

people who use tik tok are mainly people from east asia, kind of like the app douyin. musically, on the other hand, are used by people from america or european countries.

while tik tok videos show things like daily life videos, comedy, or just funny videos, musically are like people mimicking songs with their own actions, 'imitate' singers and video clips.

hope this !

the answer would be c   i believe thats the most reasonable answer