Difference between success and progress

English as a Second Language English Teacher Explanations (ESL Tests)
1

Test No. [color=blue]incompl/advan-24 “Employment and Training”, question 7

The head of department acknowledged that the … of the section was largely due to high quality support staff.

(a) success
(b) progress
(c) business
(d) future

Test No. [color=blue]incompl/advan-24 “Employment and Training”, answer 7

The head of department acknowledged that the success of the section was largely due to high quality support staff.

Correct answer: (a) success

Your answer was: [color=red]incorrect
The head of department acknowledged that the progress of the section was largely due to high quality support staff.
[size=200]_________________________[/size]

help me grasp the concept here?

2

This word would be too vague here because it is not clear enough what sort of progress it would be and where it has gone. Success is more appropriate.