Answer:
The visitors to the farm walked through the corn maze, and then they bought a pumpkin.
Explanation:
Firstly, let's see if all the revised sentences make grammatical sense.
1. The visitors to the farm walked through the corn maze, and then they bought a pumpkin.
Sentence one is grammatically correct as it uses and to connect the two clauses.
2. The visitors to the farm walked through the corn maze; bought a pumpkin.
Sentence two is not grammatically correct as it has an unnecessary semi-colon with a dependent clause.
3. The visitors to the farm walked through the corn maze, they bought a pumpkin.
Sentence three does not use and to join the two clauses.
4. The visitors to the farm walked through the corn maze; and then they bought a pumpkin.
Sentence four like sentence two uses an unnecessary semi-colon that does not follow the semi-colon rule.
A semi colon should be used to join two independent clauses or to replace (and, or, but,etc)
Hope it isn't confusing, and it helped! :))
