Which of the following qualifications invalidates a contract made by a person?

The qualification that invalidates a contract made by a person is intoxication rendering inability to understand. When an individual is intoxicated to the point where they cannot comprehend the nature and consequences of their actions, they lack the mental capacity required to enter into a binding contract. This inability to understand means that the agreement lacks mutual assent, which is essential for contract formation.

In contrast, being a minor does invalidate contracts in some cases; however, it is not as universally applicable as intoxication, since minors can enter contracts for necessities. Being in a publicly visible space does not affect the validity of a contract; rather, it relates more to privacy and the right to conduct business in public. Having access to legal counsel is advantageous but does not invalidate a contract. In fact, having legal counsel can support the validity of a contract, as it ensures that a party understands the agreement they are entering into.