Answer:
c) i think you ought to get some rest
Explanation:
Tiredness is a term that describes a state of the body that is associated with a small amount of energy, or fatigue, as a result of the exertion of the body, lack of necessary rest, or adequate sleep.
Hence, in this case, when Tom looks very tired, considering the available options, the best suggestion to him is that he ought to get some rest.
Therefore, the right answer is option C: I think you ought to get some rest
