What would decrease the resistance of wires carrying an electric current?

A decrease in length, or the use of a material with lower resistivity, or an increase in the cross-sectional area of the wire

Explanation:

The resistance of a wire is given by

where

is the resistivity of the material of the wire

L is the length of the wire

A is the cross-sectional area

We see that:

R is directly proportional to and L - therefore if we decrease one of these two, the resistance of the wire will decrease too

R is inversely proportional to A - therefore if the increase the cross-sectional area, the resistance of the wire will decrease

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

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