meaning of "On the basis of"

[Rich7]

Test No. incompl/advan-64 "Pay and Allowances", question 1

On the ......... of her ten years' service she immediately qualified for the extended annual leave of six weeks.

(a) base
(b) basis
(c) ground
(d) foundation

Test No. incompl/advan-64 "Pay and Allowances", answer 1

On the basis of her ten years' service she immediately qualified for the extended annual leave of six weeks.

Correct answer: (b) basis

Your answer was: incorrect
On the ground of her ten years' service she immediately qualified for the extended annual leave of six weeks.
_________________________

can you give a synonym for this world? or explain on the basis...

rich

[Torsten]

Because of her ten years' service she immediately qualified for the extended annual leave of six weeks.

Because she had worked for ten years she immediately qualified for the extended annual leave of six weeks.
_________________
Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Lost_Soul]

Hi, Torsten

why "on the basis" and not "on the ground" ?
for me they are pretty much the same..

thanks