Just a thought:
If the quiz-setter is being particularly pedantic, the correct answer won't be '1455' but '2.55pm'. That's because the 24-hour clock wasn't in use in Britain until the First World War (when the Royal Navy adopted it) and it wasn't used in railway timetables until 1964. (There are still a few local bus companies that publish timetables using the 12-hour clock).
So, if the word 'traditionally' in the question is all-important, the answer should use the 12-hour clock, not the 24-hour one. (I'd play safe and fill in the answer as "2.55pm (1455)"; that way, all of the options are covered!)