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"prevalent reason" is correct and usable in written English.
It is often used to describe something that is widely accepted or believed to be the main cause of something. For example, "The prevalent reason for his failing grades is that he has been skipping classes."
Exact(21)
But the most prevalent reason still is not being able to afford hundreds to thousands of dollars in lawyers' fees.
The people in the public eye who were interviewed told us that one prevalent reason why there was peace on the streets of Ireland was because people felt austerity was a natural consequence of fiscal irresponsibility.
But as the authors themselves note, "The weak economy is far and away the most prevalent reason given for why the next few months is 'not a good time' to expand".
Congestive heart failure was the third most prevalent reason in cardiac sub cohort (16).
For the time being it is not possible to conclude what the most plausible, or at least the most prevalent, reason might be that a degree of synergism possibly occurs also between several causes of this phenomenon.
The size of UC Berkeley's funding packages is "the single most prevalent reason why applicants to our grad programs decide on other schools," said Karen Rhodes, executive director of marketing and communications for the College of Engineering.
Similar(39)
The most prevalent reasons for tickets were expired meters and alternate-side violations, which together accounted for nearly a third of all parking summonses last year.
Oh, and by the way, one of the most prevalent reasons people come for counseling these days is for help with their relationships.
The most prevalent reasons for culling are low milk yield, reproductive failure, disease and age [ 29].
Sepsis is one of the most prevalent reasons for admission to ICUs in Croatia.
The causes of death were noted in the death notification forms and we report the three most prevalent reasons in each subset of patients.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com