The correct answer is: B. cost object
A cost object is anything for which costs are to be assigned. It is a central concept in cost accounting, and is used to track the costs of products, services, and activities.
A measurement object is a physical or conceptual entity that is measured. It can be a person, a place, a thing, or an event.
An accounting object is an entity that is used to track financial information. It can be a person, a business, a government, or a non-profit organization.
A budget object is an entity that is used to track budget information. It can be a person, a department, a project, or a product.
In the context of the question, the material or anything for which cost is to be measured is a cost object. This is because a cost object is anything for which costs are to be assigned.