If you can answer the question, "what is the big idea of this story? " you can likely identify the
plot
characters
dialogue
theme
pick one

the answer to this question is theme

answer; (b); the abolitionist movement;

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 !