Final answer:
The Carson Sink is located in the western U.S. state of Nevada. It is a terminal basin where waters from the surrounding area collect.
Step-by-step explanation:
The Carson Sink is part of the Great Basin and is located in the western United States. The correct answer to which state the Carson Sink is in is: a) Nevada. The Great Basin spans across several states, but the Carson Sink specifically is a terminal basin that is found in the western part of Nevada. It is one of the many sinks in the state where waters from rivers and streams in the region collect and eventually evaporate since they have no outlet to the sea.