Which of these is an example of a compound sentence?

A compound sentence has two independent clauses joined by a coordinating conjunction. In “The artist uses oil paints now, but he used to use watercolors exclusively early in his career,” both “The artist uses oil paints now” and “he used to use watercolors exclusively early in his career” can stand alone as complete sentences, and “but” joins them. The other sentences each contain only one independent clause.

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