Answer:
B. They are inversely proportional to the square of the distance.
Explanation:
The gravitational force between two objects is given by:

where
G is the gravitational constant
m1, m2 are the masses of the two objects
r is the distance between the two objects
While the electrical force is given by

where
k is the Coulomb's constant
q1, q2 are the charges of the two objects
r is the distance between the two objects
As we see from the two equations, both forces are inversely proportional to the square of the distance, so the correct option is
B. They are inversely proportional to the square of the distance.
Without a bulb energy cant go through and it would be an open circuit blocking the energy from coming out.
It's B because it talks about if it harms people. That would be an example of a medical/ethical issue.
The first is mutualism
The second is commensalism i believe (or mutualism)
The third is Parasitism