Question

who invented a practical light bulb that became widely available across america in the late 1800s?
thomas edison
elon musk
benjamin franklin
guglielmo marconi

Explanation:

Thomas Edison is credited with inventing a practical light - bulb that became widely available in America in the late 1800s. Elon Musk is a modern entrepreneur, Benjamin Franklin is known for his work in electricity but not the practical light - bulb, and Guglielmo Marconi is known for work in radio.

Answer:

Thomas Edison