Final answer:
The absolute right of a property owner to the support of their land from beneath is known as Subsurface Rights, which fall under the broader category of property rights. So, the correct answer is option a.
Step-by-step explanation:
The absolute right of the property owner to have his or her land supported from beneath its surface is known as Subsurface Rights. These rights are essential to property ownership as they ensure the owner's land is protected from subsidence and other forms of damage that could occur if the subsurface support were altered or removed.
This concept is integral to understanding property rights, which is a part of economic rights and relates to the rights of individuals to own property and use it as they see fit, including entering into contractual agreements concerning their property.
The protection of these rights is often highlighted in legal systems and is enshrined in political cultures, such as in the United States under the Fifth Amendment which emphasizes the importance of not being deprived of property without due process or just compensation. So, the correct answer is option a.