The more energy a particle of gas has (The"Hotter" It Is)The Faster It Moves.The Faster A Particle Moves, The Harder It Bounces Into Other Gas Particles And All Matter Around It.
b. Original horizontality
Hope this helps!
I believe it is C, The inner core produces electric currents that are believed to cause the magnetic field.
Since I do not have the passage i am unable to answer