Answer:
I believe the answer is A.
It could also be B too, but A seems more rationally, because if the man doesn't leaves they will not be able to go visit the person.
I'll assume this is a true of false and say true.
Our team has returned from Egypt, but other researchers are working on the site.
The word team is considered to be singular, which is why you need a singular verb as well - which is has. On the other hand, the word researchers is plural, which is why you need a plural verb, which is are working.
