What does "well back" mean?

[Jonas]

English Language Tests, Intermediate level

ESL/EFL Test #210 "What Comes Next? (4)", question 4

We should have been there 2 hours ago, ..........

(a) so we're well back
(b) so we're well off
(c) so we're well backward
(d) so we're well behind

English Language Tests, Intermediate level

ESL/EFL Test #210 "What Comes Next? (4)", answer 4

We should have been there 2 hours ago, so we're well behind.

Correct answer: (d) so we're well behind
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what does "well back" mean?

Jonas

[Mister Micawber]

.
Well back = far to/in the rear (e.g. in a race or in auditorium seating).
.
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Native English teacher at Mister Micawber's

[Saneta]

(c)so we're well backward
(d)so we're well behind

what is the difference between them?

thanks

[Beeesneees]

The first is grammatically incorrect.
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Cheers m' dears!