Meaning of 'disentangle'

[Guest]

Test No. incompl/advan-91 "GMAT Verbal Quiz (14)", question 8

The strings on the puppet were all intertwined and it took us ages to ......... them.

(a) disentangle
(b) distribute
(c) disturb
(d) distend

Test No. incompl/advan-91 "GMAT Verbal Quiz (14)", answer 8

The strings on the puppet were all intertwined and it took us ages to disentangle them.

Correct answer: (a) disentangle
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please explain

[Alan]

The strings on a puppet can easily get twisted round each other or entangled and so if you want the strings to be free, you have to disentangle them or undo them.
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