What does "fall behind" mean?

[GlummyGuy]

English Language Tests, Intermediate level

ESL/EFL Test #176 "Idioms with the prasal verb fall", question 2

Don't always ......... creating another database or a workaround program because there may actually be a better business solution for the problem.

(a) fall through
(b) fall behind in
(c) fall back on
(d) fall ou with

English Language Tests, Intermediate level

ESL/EFL Test #176 "Idioms with the prasal verb fall", answer 2

Don't always fall back on creating another database or a workaround program because there may actually be a better business solution for the problem.

Correct answer: (c) fall back on
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don't always fall behin in ?

[Mister Micawber]

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'Fall behind in' means 'fail to keep to schedule', which we don't 'always' do, and which does not make sense in the given sentence.
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Native English teacher at Mister Micawber's

[Lost_Soul]

Just in case you didnt notice, wrong answer d is mistyped (ou instead of on). Maybe it's ok for wrong answers to be mistyped, but I feel obliged to graw your attention to it

[Mister Micawber]

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[Torsten]

Hi Lost Soul,

Thanks a lot for pointing out that typo, we'll correct it.
Regards,
Torsten
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Lost_Soul]