What is the difference between "fill in" and "fill out"?

[Homy]

English Language Tests, Intermediate level

ESL/EFL Test #192 "Phrasal Verbs (D to F)", question 10

The couple ......... many forms before they could immigrate to England.

(a) filled
(b) filled about
(c) filled out

English Language Tests, Intermediate level

ESL/EFL Test #192 "Phrasal Verbs (D to F)", answer 10

The couple filled out many forms before they could immigrate to England.

Correct answer: (c) filled out

Your answer was: incorrect
The couple filled many forms before they could immigrate to England.
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What are the difference between "fill in" and "fill out"?

Homy

[Mister Micawber]

.
No difference when used of forms.
.
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Native English teacher at Mister Micawber's