C) CFCs is the correct answer.
Answer:
The power of lens is 2.22 D.
Explanation:
Given that,
Distance of image v= 45 cm
We know that,
Distance of object u= ∞
Power of lens is the reciprocal of focal length.

We need to calculate the power of lens
Using formula of lens

Where, f = focal length
v = image distance
u = object distance
Put the value into the formula



Hence, The power of lens is 2.22 D.
There are no appropriate units for power on the list you provided
You just pointed out that the gravitational force also depends
on the distance from the planet's center. The radius of Uranus
is about 4 times the Earth's radius. That fact alone means that
the gravitational force on the surface is 1/4² = 1/16 its value on
Earth's surface. So increasing the planet's mass by a factor of
14 doesn't compensate for the 1/16 reduction, and the gravitational
force on Uranus is less than on Earth.