In addition to the telephone, what else did Alexander Graham Bell invent? Correct
The correct answer is “Metal detector.” While Alexander Graham Bell is widely known for inventing the telephone, he did not invent the typewriter, sewing machine, or electric battery. The typewriter was invented by Christopher Latham Sholes, the sewing machine by Elias Howe and Isaac Singer, and the electric battery by Alessandro Volta. However, Alexander Graham Bell did play a role in the development of the metal detector. He worked on a device called the induction balance, which could locate metal objects like bullets in the human body, contributing to the foundation of metal detection technology. Therefore, the only option among those listed that Bell had a direct connection to is the metal detector.