Which sentence does not contain any errors in period usage?

a.
i've lived in boston, m. a., for about a decade.

b.
the f. a.a. released new guidelines for airline certification.

c.
we're allowed to watch tv. for 30 minutes tonight.

d.
this morning we ran 15 km to prepare for the race.

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 !