A controversial question I encountered in your my third CAT

i want to take this straight to veritasprep.
The question goes.

School Administrator: The number of fourteen year olds in Britain who are considered “gifted” – that is who score higher than 90% of their peers on the mandatory secondary school entrance exam (MSEEE) – has increased steadily over the past decade.

If the school administrator’s findings are correct, which of the following can be concluded on the basis of those findings?

A)There has been at least some improvement in British education over the past decade.

B)The number of British fourteen year olds who are not considered gifted has decreased over the past decade.

C)The number of British fourteen year olds taking the MSEEE has increased over the past decade.

D)Preparation for the MSEEE has improved in British schools over the past decade.

E)The percentage of British fourteen year olds who are considered gifted has increased as a percentage of the total population.


HERE IS MY POINT OF CONTROVERSY
if C can be concluded then E also can be concluded, just as both MUST not be concluded. Both are possible conclusions but not inevitable.
WHY?
IN E - an increase in gifted proportion can be caused by increasing number of gifted kids if the number of ungifted did not increase more than the increase in the number of gifted.

IN C - the number of kids taking taking the test can be increased by increasing number of gifted kids taking the test but not necessarily since the number of gifted can increase while the number of ungifted reduces.
So in fact C can be concluded if the number of ungifted did not reduce more than the increase in the number of gifted.

I keep believing I'm missing something. that's why i brought it here.
So how is C the answer please?
Am I missing something?