Questions 149~150 refer to the following information.The table summarizing the three categories of passengers who typically use the WestCoast Main Line high-speed railway:

【題組】149.Which category of passenger uses the West Coast Main Line high-speed railway fortraveling between cities to attend academic seminars or workshops?
(A)Tourists looking to explore different cities.
(B)Athletes participating in sporting events across different cities.
(C)Diplomats traveling to attend high-level international meetings.
(D)Graduates and postgraduates with a research interest or academic background.