A compound sentence joins two or more independent clauses with a coordinator such as and, for, or, but, or a semicolon. An independent clause is a sentence that can stand alone as a sentence as it represents a complete thought. In the case of the sentence above, the independent clauses that make up the compound sentence have been brought together by the coordinator "or".
A. Character, setting and theme can be compared and contrasted in Shakespeare's Romeo and Juliet and Julius Caesar.
echo, reverberated
D. The starlit balcony of the Capulet garden sets the scene for romance, while the stark marble of the senate steps creates a stiff, political setting.