Answer:
The water is cold, but the sand is warm.
Step-by-step explanation:
An independent clause is one that can stand alone in a sentence because it makes complete meaning by itself. This means that it does not another support from another sentence to be clearly understood by the reader. An independent clause contains a subject and a predicate. Among the options listed above, the third sentence can be identified as having two independent clauses. They are;
1. The water is cold.
2. But the sand is warm.
Each of the separated sentences still expresses a complete thought.