Why is negotiation more complicated in international transaction

A．It is a kind of costs the students should pay for studies.
B．It is a form of financial aid the students don’t have to pay hack.
C．It is the money that the students get from the colleges.
D．It is a kind of loans the students should repay when they have jobs.

A．An environment protector.
B．A visiting scholar.
C．An engineer on construction.
D．A tourist who have visited Alaska.