What was a telebook used for?

Correct answer: For reading on a screen

The governing concept is the story's contrast between a traditional printed book and a future electronic reading device. A telebook displayed written material on a screen, allowing a reader to access text without turning physical paper pages. Tommy's discovery of a printed book surprises Margie because her ordinary reading material is electronic and screen-based. Therefore option C is correct: the telebook was used for reading on a screen. It was not a cooking appliance, a repair tool, or a construction device. Options A, B, and D name unrelated activities and cannot be supported by the description of the telebook.