today-past tense

[Deleted]

Hello everybody
Please help me out with following sentences:

When my niece returns from school and I ask her.

A: How was your day? B: How's been your day?
Are both correct?

A: What did you do today? B:What have you done today? C: What were you doing today? D: What have you been doing today?
Are all of the correct?

Do all of the mean the same or not?

I am a bit confused right now.
Can somebody help me?

Thank you

Baxo

[Twoddle]

Welcome, Baxo.

When my niece returns from school and I ask her.

A: How was your day? B: How's been your day?
Are both correct?

Both are correct and both mean the same, although B is perhaps a little out-of-date in terms of modern usage; "How's your day been?" might sound better.

A: What did you do today? B:What have you done today? C: What were you doing today? D: What have you been doing today?
Are all of the correct?

Do all of the mean the same or not?

Again, all are correct and all mean the same within the context you've described.