Gino is starting in the school play, it opens next week

The answer is C: Gino is starring in the school play, which opens next week.

Explanation:

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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 !

i have a basic answer but if you want a more in depth