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D. Electrical conductivity

Explanation:

It is showing how the negative charge of the battery can reach the lightbulb by going through the piece of iron.

answer: this problem has only trivial solutions, with all points on the same line. x=5 or x=7/5.

step-by-step explanation:

there are three triangles, and three unknowns: x, y=length of middle segment, and z=cos(angles marked with red arc).

we need

and law of cosines,

the three equations are

see attached image for solution.

b) they want the land taken away from the wealthy landowners and given to peasants.