John and Henry Are U

John and Henry are U.S.citizens and work for the same law firm that is headquartered in New York.John,however,works from the firm's London office,while Henry works from the office in New York.Which of the following is a difference between the two employees?

A) John is an expatriate,whereas Henry is a parent-country national.
B) John is a host-country national,whereas Henry is an expatriate.
C) John is a third-country national,whereas Henry is a host-country national.
D) John is a parent-country national,whereas Henry is a host-country national.
E) John is repatriate,whereas Henry is a third-country national.