Answer: D. Earlier, Rick had seemed uninterested; today, he looked downright enthusiastic.
Explanation: It's a continuation of the sae subject so you use ; (semi-colons).
Answer:
I would have to say in 'Animals in the zoo' they were Concerned and in 'Winter Driving' they were Cautious.
Why?: In the story Animals in the Zoo, when it said "Preston told the group that the kudus were losing their habitat in the wild and asked if anyone knew why this was happening.
Ryan raised his hand as fast as he could and answered with certainty" he was Concerned.
In the story Winter Driving, when it said "Jesper had to get home, but he wasn't too worried because he had always been a cautious driver." Jesper was Cautious.
You will need to add the commas as follows:
I think Robert, Mary Jane, Andrea, Lee Ann, and Milton should be on the planning committee.
There are 4 commas.