Allegations vs. accusations

Test No. [color=blue]incompl/inter-37 “Eating Disorder”, question 1

George Turnip was a highly respected vegetarian but the press were making serious about him.

(a) accusations
(b) insinuations
© intimations
(d) allegations

Test No. [color=blue]incompl/inter-37 “Eating Disorder”, answer 1

George Turnip was a highly respected vegetarian but the press were making serious allegations about him.

Correct answer: (d) allegations

Your answer was: [color=red]incorrect
George Turnip was a highly respected vegetarian but the press were making serious accusations about him.
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what about accusations here?

Accusations are usually OF something