The word are is a Linking Verb
The claim is usually defined as your belief, like what you think it is. Example: I believe that all spiders are bad, but on the other hand... something like this i think. I hope this helps you.
Answer:
The best answer would be D. The men are serious and they are also doomed to an early death
Explanation:
The word "grave" gives us the picture of serious, distressed men, which would be understandable under the circumstances.