_______ he is very young, _______ he knows a lot about how to be healthy.

_______ he is very young, _______ he knows a lot about how to be healthy.

A．Though; but       B．Although; but      C．／;but            D．Although;／

_______ he is very young, _______ he knows a lot about how to be healthy.

1. A.
   Though; but
2. B.
   Although; but
3. C.
   ／;but
4. D.
   Although;／