Answer:
Answer is B.
Explanation:
The main focus is that the dog is being trained.
We can't see underlining here, but here, I think this will be helpful:
"I read a novel" would be the intependent clause: it does not need the other one to be complete.
"until the guests arrived" is the subordinate clause: it needs the independent, main clause to be complete.
Answer:
This is a run on sentence.
Explanation:
These two parts can be sentences on their own, and If they were they would be He went to the store. THEN he bought a candy bar. I hope this helps you!