Answer :
Lets see one by one. Option A: It rained all weekend and, we came home early from the trip. It is introducing a split after "and" that cuts the sentence without any sense. Option B. It rained all weekend and we came home early from the trip. It correctly uses the conjunction "and" to separate the two clauses is a good way. C. It puts the conjunction "and" between commas which is not a correct use of commas. The option D. introduces a comma before and to separate the clauses but that is the function of the conjunction. Then, the answer is that the sentence that does not contain any punctuation errors is the option B.
