Write a multi-choice question for the following article, with the given choices and answer: Article: Paris Passengers carried per day: 4.4m Cost of ticket: 80p flat fare Length: 131 miles Lines: 14 Stations: 297 In Paris there are pleasures for those who use the Metro -- many of them artistic. The graceful Art Nouveau dragon-fly entrances are just the most noticeable on a Metro system which celebrated its 100thanniversary by spending 30 million francs (PS2.9million) on making its stations works of art. On my way home I pass Bonne Nouvelle station in the heart of Paris's cinema district. There, during the cinema festival this summer, special lighting effects dot the platforms and films are projected onto the large advertising boards. More than anything the metro is efficient. "When I worked on line 4", says a retired driver, "we had exactly 30 minutes and 15 seconds to complete the journey. If it took any longer, they cut our pay." But there are problems. Many Metro stations have too many stairs, and changing lines at big interchanges can be tiresome. Moscow Passengers carried per day: 9m Cost of ticket: 12p Length: 164 miles Lines: 11 Stations: 162 The first underground passage for the Moscow Metropolitan started in 1932. Three years later the trains started running. They haven't stopped since-- every 90 seconds or two minutes during rush hour, every five minutes the rest of the time, from 6 a.m. till 1 a. m. There may be a crowd of people but there is seldom a wait. The trains take you through spacious and spotless stations. For tourists it's a major sightseeing attraction: from Russian Art Deco to neo-classical, the Metro stations are not to be missed. Tokyo Passengers carried per day: 7m Cost of ticket: 90p ~ PS1.68 Length: 177 miles Lines: 12 Stations: 209 Trains do not just arrive on time in Tokyo. They stop right on the platform mark so that passengers can line up knowing exactly where the doors will open. Train driving is a respectful job for life, for which the applicants must pass a strict screening of health checks, interviews and written exams before they can put on the enviable... Options: A keep to the train schedule strictly B complete the journey gracefully C stop right on the platform mark D understand the special lighting Answer: A keep to the train schedule strictly Question:
The answer to this question is:
Metro rail drivers in Paris must _ .