ETNA IS AN ACTIVE VOLCANO. THE VOLCANO IS ON THE ISLAND OF SICILY....

21. - CAU HOI ON TAP HK 2 TIENG ANH 9VIET
CAU HOI ON TAP HK 2 TIENG ANH 9VIET

21. Etna is an active volcano. The volcano is on the island of Sicily.

A. Etna which is on the island of Sicily is an active volcano.

B. Etna, which is on the island of Sicily, is an active volcano.

C. Etna that is on the island of Sicily is an active volcano.

D. Etna which is an active volcano is on the island of Sicily.