Answer: The sentence that best shows correct comma usage is C. You can show up late for class, or you can try to come on time.
Explanation: <u>One of the rules of comma usage states that a comma must always be added before a coordinating conjunction.</u> A coordinating conjunction is a word that joins two independent clauses, that is to say two clauses that can stand alone as sentences. Some coordinating conjunctions are "and", "or" and "but". Moreover, the rules of comma usage also state that a comma should not be added after the coordinating conjunction. <u>As sentence C. is the only one that includes a comma before the coordinating conjunction "or" and not after it</u>, <u>C. is the sentence that best shows correct comma usage. </u>
-he invented the electric telegraph that transmitted information instantaneously. -he developed the semaphore system, there by revolutionizing communications. -Telegraph wires spread across the continent by following railroad tracks west. -The first telegraph.
