Answer:
The answer to the question: Which sentences in the passage are grammatically correct? would be onlt option 2, from the options given by the answer key.
Step-by-step explanation:
The reason for this is that this sentence is the only one that fulfills the necessary grammatical structural rules, in writing. All other choices fail this by the incorrect use of punctuation marks, wrong use of capital letters, among other structural errors. Option 2 is the only sentence in which there is a correct use of commas, given that the phrase between the two sentences is added information, and in this case a comma must come before the and. In option four, the only error is that the comma should not have been used.