Which sentence uses commas correctly?

A.
Computers are useful tools, and, they are becoming more powerful every year.

B.
Seaweed floats in the ocean, and some kinds can be harvested for food.

C.
The blue whale is the largest animal on Earth and it is larger than any of the prehistoric dinosaurs.

D.
Volcanoes spew molten rock and, they mostly exist along the Pacific Rim.

Question

Which sentence uses commas correctly?	
 
 A.
Computers are useful tools, and, they are becoming more powerful every year.
 
 B.
Seaweed floats in the ocean, and some kinds can be harvested for food.
 
 C.
The blue whale is the largest animal on Earth and it is larger than any of the prehistoric dinosaurs.
 
 D.
Volcanoes spew molten rock and, they mostly exist along the Pacific Rim.

anonymous · Answer

@KyanTheDoodle 
@bluediamond1999

kyanthedoodle · Answer

Which ones can you eliminate?

anonymous · Answer

D. C. And A.

anonymous · Answer

We can eliminate a, because you would not have commas on both sides of a conjunction.

anonymous · Answer

Correct! B is the right answer. :-)