Question

which statement best expresses a central idea of the text? choose 1 answer. a before the radio, communication was limited by distance and speed. b the radio democratized information so it was accessible to more people. c the invention of the radio transformed communication. d marconi invented the radio in his mother’s attic when he was just 20 years old.

Explanation:

The central idea should capture the overall impact of the radio on communication. Option A only mentions pre - radio limitations, Option B focuses on information access, Option D is about the inventor's personal story. Option C best sums up the transformative effect of the radio on communication.

Answer:

C. The invention of the radio transformed communication.