Question

A comma

cannot be used to correct most run-on sentences

can be used to correct most run-on sentences

can be used to combine two independent clauses correctly

is required to combine two dependent clauses correctly

Answer 1

@Smores

Answer 2

B because it corrects lists so you don't put "bread and milk and bacon and eggs and pencils".

Answer 3

^^^^^Smores actually what you illustrated is the need for the Oxford Comma which is not necessarily correct.