It protects us from the magnetic/electrical radiation that comes from the sun. High radiation periods coincide with solar storms.
I think it is A) but someone might need to double check that.
We need to consider for this exercise the concept Drag Force and Torque. The equation of Drag force is

Where,
F_D = Drag Force
= Drag coefficient
A = Area
= Density
V = Velocity
Our values are given by,
(That is proper of a cone-shape)



Part A ) Replacing our values,


Part B ) To find the torque we apply the equation as follow,


