How many planets are there in the solar system revolving around the sun

A. It will be much more complex than the telephone we use today.
B. It will be more convenient to use than today’s telephone.
C. Yon will be able to dial great distances.
D. There will be no busy lines.

A. In all countries in the world.
B. In only a few countries.
C. In most countries.
D. Mainly in developed countries.