'almost a concern' vs. 'fairly a concern'

[Halmas]

English Language Tests, Intermediate level

ESL/EFL Test #87 "Present Simple (4)", question 6

It was a different sort of worry that was ......... a concern. He wants to see her again.

(a) exactly
(b) fairly
(c) usually
(d) almost

English Language Tests, Intermediate level

ESL/EFL Test #87 "Present Simple (4)", answer 6

It was a different sort of worry that was almost a concern. He wants to see her again.

Correct answer: (d) almost

Your answer was: incorrect
It was a different sort of worry that was fairly a concern. He wants to see her again.
_________________________

why its almost and why cant it be fairly?

Halmas

[Alan]

Hi Halmas,

You asked:

[Saneta]

he failed by three seconds=it was lacking him three seconds to be a new champion?

thanks