The telephone was invented by Alexander Graham Bell in:

This question tests knowledge of significant historical inventions and their timelines, specifically focusing on the invention of the telephone, which revolutionized global communication.

• The correct option is 1876. Alexander Graham Bell was granted the first U.S. patent for the telephone on March 7, 1876. This pivotal event marked the official invention of the telephone, ushering in a new era of instant long-distance communication.
• Distractors: "1856" and "1866" are too early; Bell was still conducting experiments and developing his concepts during these periods. "1888" is too late; by this time, the telephone was already in commercial use and undergoing further technological advancements and widespread adoption.