Which sentence does not contain any errors in comma usage?

A.
Gorillas travel in packs, walk on all fours, and sometimes stand upright.

B.
Gorillas travel in packs, walk on all fours, and, sometimes stand upright.

C.
Gorillas travel in packs walk on all fours and sometimes stand upright.

D.
Gorillas travel in packs walk on all fours, and sometimes stand upright.

Question

Which sentence does not contain any errors in comma usage?
 
 A.
Gorillas travel in packs, walk on all fours, and sometimes stand upright.
 
 B.
Gorillas travel in packs, walk on all fours, and, sometimes stand upright.
 
 C.
Gorillas travel in packs walk on all fours and sometimes stand upright.
 
 D.
Gorillas travel in packs walk on all fours, and sometimes stand upright.

anonymous · Answer

to find the answer just read the sentences out loud, reading the commas as pauses until you find the one that sounds right

anonymous · Answer

All three thoughts "Travel in packs", "walk on all fours", and "and sometimes stand upright" need to be separated by commas. But there is no need for "and" to have a comma on both sides.

vera_ewing · Answer

Yep, so it's A. :)

anonymous · Answer

A is right :)