What does 'walk back up' mean?

[Simin]

English Error, Elementary Level

ESL/EFL Test #21 "Thank you letter", question 6

He had to walk back up the garden path in order to hand it for me.

(a) back up
(b) in
(c) for

English Error, Elementary Level

ESL/EFL Test #21 "Thank you letter", answer 6

He had to walk back up the garden path in order to hand it to me.

Correct entry: to
The error was: (c) for
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Dear Alan, What is the meaning of "walk back up"? Thanks

Simin

[Alan]

Hi,

This simply means 'return (walk back) up the garden path.

Alan
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English as a Second Language
You can read my ESL story Present Simple