grammaticality - Use of "confess" when followed by interrogative clause (e.g. I confessed to my parents what I ate last night)

I am not a native speaker, but just wondering if you can use a non-why question as the embedding clause of confess.

a. I confessed to my wife why I started smoking again.

(Pretty sure this one with why-question is grammatical, right?)

What about:

b. I confessed to my parents what I ate last night.

(Suppose that my parents do not let me eat junk food, but last night I ate potato chips secretly and felt guilty about it.)

c. I want to confess to my parents what I ate last night.

(Same context as (b))

Thank you!