meaning of Shortfall

[natasha]

Test No. incompl/advan-11 "Finance", question 3

There is a substantial ......... between the money you have available and the amount you need to spend.

(a) shortdrop
(b) shortfall
(c) shortdown
(d) shortslide

Test No. incompl/advan-11 "Finance", answer 3

There is a substantial shortfall between the money you have available and the amount you need to spend.

Correct answer: (b) shortfall
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What word fit to this sentence?

natasha

[Alan]

This word shortall means gap or space and is needed here.
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