What is the legal age for a person to enter into a binding contract in Arizona?

The legal age for entering into a binding contract in Arizona is 18 years old. This aligns with the general principle of contract law, which establishes that individuals must reach the age of majority to have the legal capacity to form contracts. The age of majority in Arizona, as in most states, is 18, meaning that individuals below this age are considered minors and do not have the legal authority to enter into most contracts without parental consent or in certain specific circumstances. Therefore, option C is the correct choice, as it accurately reflects the age at which a person can legally engage in binding contracts in Arizona.