Final answer:
A small employer would not have a restricted ability to enter into a contract, as opposed to mentally ill persons, minors, or those under the influence who may have their contract capacity questioned.
Step-by-step explanation:
Among the listed options, a small employer would NOT have a restricted ability to enter into a contract. In the context of law, certain parties like mentally ill persons, minors, and those under the influence of alcohol may have their capacity to contract questioned, which could lead to the contract being void or voidable. However, a small employer, assuming they do not fall into any of the aforementioned categories, generally retains the legal capacity to enter into binding contracts.