Meaning of finished off quickly

[jorien_]

Test No. incompl/elem-5 "Finish/End", question 5

It didn't take long for the children to ......... off the cakes and pastries that had not been eaten at the party.

(a) end
(b) ending
(c) finish
(d) finishing

Test No. incompl/elem-5 "Finish/End", answer 5

It didn't take long for the children to finish off the cakes and pastries that had not been eaten at the party.

Correct answer: (c) finish

Your answer was: correct
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What does this sentence mean?

[Torsten]

The children ate the cakes and pastries very fast. They devoured the food.
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