The Office of Management and Budget wants to hire you as a consultant to train its Accounting staff of $15$ persons in Grants management. The contact person suggests that the office has only a budget of $$700$ but the only available training site has a booking cost of $$200$ and charges $$50$ per person. How many persons can this budget train from the Accounting staff.

A$.15$

B$.9$

C$.11$

D$.10$