Ответ:

1 She’s playing now!
2 Tim doesn’t get up late at the weekend.
3 I’m doing my homework at the moment.
4 I go online every day.

a) Present simple: sentences 2 and 4. Present continuous: sentences 1 and 3.

b) Sentences 1 and 3 refer to actions happening now.

c) Sentences 2 and 4 refer to repeated actions or routines.