Concept checking is the process of a teacher asking questions to their students to make sure they understand the vocabulary/grammar you have taught them. =)
The comma is after a kind of letter like Yes or No a sentence, so the answer would be B. Believe it or not Joe, it is for us to leave.
Since you provided a time, I am taking a guess that it's online and the teacher or professor should usually give you a time that officially marks when it's due on January 3rd. If not, you could turn it in on January 3rd anytime, but not after 12:00 a.m. which would make it January 4th. I hope this makes since.
Answer:
b. Jupiter is the largest and most prominent planet in the solar system. It is the fifth planet in the solar system, followed by the planet Saturn, which is the sixth planet in the solar system.
Explanation:
"Largest and most prominent" is redundant.
To say that Saturn is the sixth planet after saying that Jupiter is the fifth planet is overly wordy.