Daily Quiz: What does “哥们儿 (gēmenr)” mean here?

Beginner Level 初级 (chūjí)

Conversation:
         Gēmenr, xiàwǔ dǎ lánqiú ba.
Mike: 哥们儿，下午  打 篮球    吧。
         Méi wèntí.
Tom: 没   问题。
What does “哥们儿 (gēmenr)” mean here?
A. older brother
B. younger brother
C. buddy