Question

who found a way to insulate telegraph wires effectively for underground and under water?
samuel morse
guglielmo marconi
werner von siemens
thomas edison

Explanation:

Werner von Siemens developed a method to effectively insulate telegraph wires for underground and underwater use. He made significant contributions to electrical engineering. Samuel Morse is known for the Morse - code, Guglielmo Marconi for radio communication, and Thomas Edison for many inventions like the light - bulb but not specifically for this insulation method.

Answer:

C. Werner von Siemens