Which preposition to use with controversial

of Occurrences 2%

The Constantinople route is the most natural and least controversial of these.

about Occurrences 1%

Mr. Blades had, as his friend Dr. Garnett observes, a debonair spiritthere was nothing fiery or controversial about him.

for Occurrences 1%

" An appropriate April book, too controversial for extensive quotation in our pages, as the enumeration of its contents will prove.

Which preposition to use with  controversial