Help asap I don't get this and I don't get much time I'll give u the brain list Alnico is .

an alloy of metals with strong magnetic properties
a brittle mixture of substances containing ferromagnetic elements
any material containing iron
an element found in nature that behaves like a magnet

e) none of the above answers are correct

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..