Comparision is a non-countable noun, why it had "a" before it?

[Dthong]

English Grammar Error, Intermediate level

ESL/EFL Test #3 "Sally and her Letter", question 9

The whole point of the exercise is to make a compare between the two types of technology.

(a) The whole
(b) of
(c) compare
(d) types

English Grammar Error, Intermediate level

ESL/EFL Test #3 "Sally and her Letter", answer 9

The whole point of the exercise is to make a comparison between the two types of technology.

Correct entry: comparison
The error was: (c) compare
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Is it right to use comparision? Comparision is a non-countable noun, why it had "a" before it?

[Mister Micawber]

.
'Comparison' here is a countable noun: 'one comparison', 'two comparisons'.
.
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Native English teacher at Mister Micawber's