Please find attached photograph for your answer. Please do comment whether it is useful or not
i believe thaT IT IS B BUT PLEASE TELL ME IF IM WRONG I WAS JUST USING LOGIC
Explanation:
Power is defined as the rate at which work is done in per unit time.
Mathematically, 
It is given that work done by engine is 4,560,000 J and time is 20 minutes.
There is 60 seconds in 1 minute. So, convert minutes into seconds as follows.

= 1200 seconds
Calculate power output of the engine as follows.
= 
= 3800 J/s
or, = 3800 Watt
Therefore, the power output of the engine is 3800 Watt.
Answer: B
Explanation: A sphere is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball (viz., analogous to the circular objects in two dimensions, where a "circle" circumscribes its "disk"). Like a circle in a two-dimensional space, a sphere is defined mathematically ... This distance r is the radius of the ball, which is made up from all points.