Which sentence BEST states the main idea of paragraph 4?
Earth's magnetic field forces solar wind
to slip around the planet.
4 Earth is a huge magnet. It has two
magnetic poles, north and south.
These poles are part of a larger field
of magnetic force surrounding the
planet. This field forces the solar
wind to slip around our planet, much
as a tree blocks a breeze. It also
reduces the power of solar flares
and CMES.

A. A huge magnetic field
surrounds Earth.

B. Earth's magnetic field reduces the power
of CMEs.

C. Earth's magnetic field protects it from all
types of space weather.

D. Earths magnetic field forces solar wind to slip around the planet