Read the sentence. Once you have received the field trip permission form, you should have asked for your guardian’s signature.

Which revision is the correct way to edit this sentence?

A. Once you have received the field trip permission form, you should ask for your guardian’s signature.

B. Once you have received the field trip permission form, you should be asking for your guardian’s signature.

C. Once you have received the field trip permission form, you should have had asked for your guardian’s signature.

D. The sentence is correct as it is.