Answer:
A. dürfen
Explanation:
The subject is a plural noun, so it requires a plural verb.
Answer:
I think it's all of the above. But It could just be Bruder if you have to pick one.
Explanation:
Cognates are two words from different languages that have a common origin/meaning/spelling. All of these German words are very similar to their english definitions.
If none of the above isn't an option then choose Bruder, because I know they have a similar origin.
start working, or keeping going to school, hope this helps