What does this mean: "the paper feeds through"?

[Robertos]

Business Idiom in English, Intermediate level

ESL/EFL Test #111 "Faxes", question 10

Push the start button to send the fax, then watch to make sure the paper ......... through right and does not get wadded up.

(a) slides
(b) moves
(c) feeds
(d) passes

Business Idiom in English, Intermediate level

ESL/EFL Test #111 "Faxes", answer 10

Push the start button to send the fax, then watch to make sure the paper feeds through right and does not get wadded up.

Correct answer: (c) feeds

Your answer was: incorrect
Push the start button to send the fax, then watch to make sure the paper passes through right and does not get wadded up.
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why feeds?

Roberto

[Mister Micawber]

.
Feed(v.i.) =

3a. To move steadily, as into a machine for processing. b. To be channeled; flow: This road feeds into the freeway (American Heritage Online)

3 a : to become channeled or directed b : to move into a machine or opening in order to be used or processed (Merriam-Webster Online)
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Native English teacher at Mister Micawber's