Why does the author assert that through travel We only 'truly touch one another'?
A.Because he believes tourism makes it possible for people to help one another.
B.Because he thinks that sincere learning of a culture is only possible by travel.
C.Because he believes travel is the only way which can mix up different cultures.
D.Because he wants to emphasize tourism's powerful effect on combating social problems.

A.Because
B.
B.Because
C.
C.Because
D.
D.Because