Возникла потребность в уточнении. Укажите предложение в Present Progressive( Continuous)

Выберите один ответ:

a.
They haved played football by 6 o'clock.


b.
They have been playing football since morning.


c.
They were playing football at 3 o'clock yesterday.


d.
They usually play football on Sunday.

Предложение в Present Progressive (Continuous):

b. They have been playing football since morning (в переводе на русский язык: Они играют в футбол с утра).