what is a purpose of the parol evidence rule? multiple choice to restrict oral evidence from being admitted that supports an agreement in its written form. to restrict written evidence from being admitted that supports an agreement in its written form. to restrict hearsay from being admitted that supports or contradicts an agreement in its written form. to restrict oral and written evidence from being admitted that supports an agreement in its written form. to restrict evidence from being admitted that substantially contradicts an agreement in its written form.