' C ' is the only correct statement on the list. We don't know anything about diagram-x or diagram-y because we can't see them.
Answer: Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
Explanation:
We can salve the problem by using the formula:

where F is the force applied, k is the spring constant and x is the stretching of the spring.
From the first situation we can calculate the spring constant, which is given by the ratio between the force applied and the stretching of the spring:

By using the value of the spring constant we calculated in the first step, we can calculate the new stretching of the spring when a force of 33 N is applied:

The strength of the gravitational forces between two masses depends on
-- the product of the masses,
-- the distance between their centers of mass.
By studying meteorites which are the most ancient material in space.