a large gap between the platform and the train?

[Immediate]

English Language Tests, Intermediate level

ESL/EFL Test #67 "How to attract someone", question 6

Be careful, there's a large ......... between the platform and the train.

(a) gap
(b) fall
(c) area
(d) line

English Language Tests, Intermediate level

ESL/EFL Test #67 "How to attract someone", answer 6

Be careful, there's a large gap between the platform and the train.

Correct answer: (a) gap
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why do i have to say gap

[Mister Micawber]

Beause that is the only English word among the choices given that has the right meaning.
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Native English teacher at Mister Micawber's

[Our Tort System]

Yeah, and the annoucer always says at every station: please, mind the gap between the platform and the train.
=)
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If it's not easy, don't do it!
That's how I got where I am.