What does the word STAFF refer to in the first paragraph

A．The success of a language camp depends on the selection of staff and campers only.
B．Every teenager can be allowed to participate in the camp.
C．Language camps are restricted to foreign language practice solely.
D．Without a good staff, the language camp program is bound to fail.

A．create a language environment in which young people can acquire a foreign language
B．free the Americans from the restraint of not being able to talk in a foreign language
C．reinforce what the students have learned during the academic year
D．eater to the students' interest in computers and foreign languages