Explanation: To obtain a Second Class Radiotelegraph Operator's Certificate, the Federal Communications Commission (FCC) requires specific knowledge and skill demonstrations. This license is a commercial certificate for operating certain radio equipment, particularly in marine or international radiotelegraphy. The requirements are: * **Written Test Element 1:** Covers basic radio law and operating practices relevant to commercial radio operations, including marine radio. * **Written Test Element 5:** Focuses on radiotelegraph operating practices, procedures, and international regulations. * **Written Test Element 6:** Addresses advanced radiotelegraphy, including electronic fundamentals, power sources, and troubleshooting specific to radiotelegraph equipment. * **Telegraphy Element 1:** Demonstrates the ability to send and receive Morse code at 16 code groups per minute. * **Telegraphy Element 2:** Requires sending and receiving Morse code at 16 code groups per minute and plain language text at 20 words per minute. Option C correctly lists these specific written Elements 1, 5, and 6, along with telegraphy Elements 1 and 2, which are the exact requirements set forth by the FCC for this certificate. Option A is incorrect because it includes Element 3 (General Radiotelephone Operator's Test) and omits Element 6, which is crucial for advanced radiotelegraphy. The telegraphy description is also less precise. Option B is incomplete as it only lists the telegraphy elements, omitting all the necessary written examinations. Option D is incorrect because it includes Element 3 (not strictly required for this specific certificate, Element 6 covers the necessary electronics) and incorrectly refers to "telegraphy Element B" instead of Element 2.