If you want to say yes:
Si, necesito esa taza.
If you want to say no:
No, no necesito esa taza.
It's describing the chica, which is singular and also feminine, so therefore we must use la.
Numbers are infinite there’s no stop to them
I think is the third one, because in the giving sentence it says: I don’t like doing sports, so I think the third one fit in for that.
1. estudio
2. hablan
3. escuchamos
4. alardea
5. coquetea
hope it helps !!