Which of the following actions can NOT be included in a real estate contract for clients?

The correct answer highlights an essential aspect of real estate contracts and the relationship between agents and clients. Preventing clients from going elsewhere after a contract expires is not permissible because once a contract has ended, clients are free to make their own choices regarding their representation or property transactions.

In real estate, a contract usually includes terms for the duration it is in effect and the obligations of both parties during that time. When the contract expires, the obligations typically cease, allowing the client the freedom to seek other options or engage with different agents. This reflects the principle of agency and the clients' rights to navigate their real estate options without restrictions.

In contrast, the other actions mentioned in the options are often seen in contracts, where agents may seek exclusivity, limit property showings to maintain control over a property marketing strategy, or restrict clients from considering other offers to protect their interests while the contract is active. These actions must adhere to the rules and regulations of agency relationships, but they are enforceable within the context of an active contract.