Select one:

A$.$ A contract is mot modified by evidence of the existence of a condition precedent.

B$.$ Evidence of the existence of a condition precedent agreed to orally is inadmissible.

C$.$ A contract's enforceability is called into question by evidence of the existence of a condition precedent.

D$.$ When an entire contract is conditioned on something occurring first, that first thing is known as a condition precedent.

E$.$ The parol evidence rule does not apply to evidence of a condition precedent.