The correct answer is option 'A' - Void.

Explanation:
When an agreement is considered to be void, it means that it is completely invalid and has no legal effect. In the context of contract law, an agreement can be deemed void if the object or consideration of the agreement is unlawful.

1. Unlawful Object:
An object refers to the purpose or goal of the agreement. If the object of an agreement is illegal, immoral, or against public policy, the agreement will be considered void. For example, if two parties enter into an agreement to engage in illegal activities such as drug trafficking or money laundering, the agreement will be void because the object is unlawful.

2. Unlawful Consideration:
Consideration refers to the value or benefit that each party to the agreement gives or promises to give to the other party. If the consideration involved in the agreement is illegal, the agreement will be void. For instance, if two parties enter into an agreement where one party promises to commit a crime in exchange for money, the agreement will be void because the consideration is unlawful.

3. Effect of Void Agreement:
When an agreement is void, it is essentially treated as if it never existed. Neither party can enforce the terms of the agreement, and they are not legally bound to perform their obligations under the agreement. Additionally, any property or money transferred under the void agreement must be returned to the original owner.

4. Distinction from Voidable Agreement:
It is important to note that a void agreement is different from a voidable agreement. A voidable agreement is one that is initially valid but can be later avoided or canceled by one of the parties due to certain legal grounds, such as fraud or misrepresentation. In contrast, a void agreement is invalid from the beginning and cannot be enforced by either party.

In conclusion, an agreement with an unlawful object or consideration is considered void because it goes against the principles of law and public policy. Such agreements have no legal effect, and the parties involved are not bound by their obligations.