Expression: 'a peak'

[Tom]

Business English Lesson, Advanced Level

ESL/EFL Test #140 "Annual Report", question 5

Costs reached ......... in April.

(a) an acme
(b) an apex
(c) a climax
(d) a peak

Business English Lesson, Advanced Level

ESL/EFL Test #140 "Annual Report", answer 5

Costs reached a peak in April.

Correct answer: (d) a peak

Your answer was: incorrect
Costs reached a climax in April.
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Hi

Could you please shed some light on why others are not the correct option(s) here? Acme, climax etc

Tom

[Mister Micawber]

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They do not collocate, Tom-- that is all. High points when e.g. graphing costs are called peaks because they look like mountain tops, I suppose.
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Native English teacher at Mister Micawber's

[Prezbucky]

An apex is a mountaintop too, though.

Acme is Wile E. Coyote's company.

A climax is, well, we know what that is. hehe
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Billie Jean is not my lover. Hee.

[Mister Micawber]

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SYNONYMS: summit, peak, pinnacle, acme, apex, zeith, climax These nouns all mean the highest point. Summit denotes the highest level attainable: “This [appointment] had been the summit of Mr. Bertram's ambition” (Sir Walter Scott). Peak usually refers to the uppermost point: “It was the peak of summer in the Berkshires” (Saul Bellow). Pinnacle denotes a towering height, as of achievement: The articulation of the theory of relativity catapulted Einstein to the pinnacle of his profession. Acme refers to an ultimate point, as of perfection: The artist's talents were at their acme when this work was created. Apex is the culminating point: The military regime represented the apex of oppression and intimidation. Zenith is the point of highest achievement, most complete development, or greatest power: “Chivalry was then in its zenith” (Henry Hallam). Climax refers to the point of greatest strength, effect, or intensity that marks the endpoint of an ascending process: The government's collapse was the climax of a series of constitutional crises. (Am Heritage Dict)