rivers/ streams/ seas/ dirtied/ activities/ land.

Câu hỏi: rivers/ streams/ seas/ dirtied/ activities/ land.

A. Rivers, streams, and seas is being dirtied by activities on land.

B. Rivers, streams, and seas are being dirtied by activities on land.

C. Rivers, streams, and seas is being dirtied by land activities.

D. Rivers, streams, and seas are being dirtied activities on land.