Answer:
John is a parent-country national, whereas Henry is a host-country national.
Step-by-step explanation:
-Expatriate: is a person that lives in a country that is not his/her native country.
-Parent-country national: is a person that is working in a country that is different from his/her native country but he/she has the same nationality as the company that he/she works for.
-Host-country national: is an employee that is from the country in which the company is operating.
-Third-country national: is a person that has a nationality that is different from that of the firm and from the country in which he/she is working.
-Repatriate: is a person that returns to his country of origin.
According to this, the answer is John is a parent-country national, whereas Henry is a host-country national as both are from the US but John works in London and Henry in New York.