How Did the Spread of Television in Its First Decade

How did the spread of television in its first decade compare with the spread of radio during its first decade?

A) Radios spread into 40% of all households, while televisions spread to almost 90% of all households.
B) Radios spread into 40% of all households, while televisions only spread into about 25% of all households.
C) Radios spread into 90% of all households, while television only spread to about 40% of all households.
D) The pattern was about the same for each medium as penetration was nearly 40% during the first decade.