Reel vs Spool

[Duc]

Hello,
I have a question for you :
Choose the best answer:We made a wooden toy with an empty cotton....and some glue.
A.roll B.reel C.glue D.spool
The correct naswer is ''B'' but I think spool is possibly correct because they have the same meaning. Please explain it
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Don't see your shade think you are great

[Mister Micawber]

.
Yes, I think the given answer is wrong. To me, it is a 'spool' of thread, not a 'reel'.
.
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Native English teacher at Mister Micawber's