15. Foreigner: Excuse me. How can I get to your office to apply for my police criminal recordcertificate? Can I take the bus?Duty officer: If you are not considering taking the MRT, you can take bus 236.Foreigner: How often does the bus leave for your office?Duty Officer: _________________________.
(A) Early in the morning
(B) Twenty minutes later
(C) It runs always
(D) In ten minutes
(E) Every half an hour