Question

Which sentence does not contain any errors in comma usage?



A.
The Chinese kept the formula to themselves, but, in 751 the Arabs learned the Chinese secret.


B.
Some papermakers used rags, and others used animal hides.


C.
The inventor gathered bark and rags and then he or she made a pulp.


D.
A paper mill eventually opened in Spain and, the art of making paper spread from there.

Answer 1

@Puahina

Answer 2

The answer is B.