Which of the following is an example of a compound sentence?

A compound sentence is defined as a sentence that contains at least two independent clauses joined by a coordinating conjunction (such as "and," "but," or "or"). In the example provided, "I wanted to go for a walk" is one independent clause, and "it started raining" is another independent clause. The use of the coordinating conjunction "but" connects these two ideas, illustrating the relationship between the desire to walk and the interruption caused by the rain. This structure allows for a more complex thought, showing how both clauses can stand alone as complete sentences yet are thoughtfully joined to convey a nuanced message.

The other examples do not contain two independent clauses that are combined with a coordinating conjunction, thus they do not qualify as compound sentences. Instead, they are either simple sentences or contain additional information that doesn't create a separate independent clause.