No less an authority than

[heymayank08]

No less an authority than Walter Cronkite has reported that half of all Americans never read a book.
(A) No less an authority than
(B) Nonetheless an authority
(C) Nevertheless authoritarian
(D) Not less an authority than
(E) An authority not less than


OA a

[LalaB]

no less than is an idiom

https://idioms.thefreedictionary.com/no+less+than

[sam2304]

IMO A.

Idioms - we need to learn nothing else can be done.