Students because their is referring to the students. Students is the antecedent because an antecedent is just a phrase that replaces the third-person personal noun. Their would be the personal noun. Hope this helps!
All of the above are common linking expressions. But if you must chose one pick and, or but.
Answer:
Part A.
I think the Answer is He mopes about it and feels sorry for himself.
Part B.
"They clearly did not comprehend the gravity of the situation. As Carlos continued to lie, fuming,on his bed, the doorbell rang."
Explanation:
I hope this helps!!! :)