I believe the answer is C. Stage 5
hope its helps!!!
Answer:
Temperature of the sink will be 191.1 K
Explanation:
We have given that heat withdrawn form the source = 10 KJ
Work done = 3 KJ
We know that efficiency is given by

Higher temperature is given by 
We have to find the lower temperature 
We know that efficiency is also given by

So 
So temperature of the sink will be 191.1 K
Distance = 2AU / tan1.0
If you mean 1.0 is in degrees, then Distance = 114.58 AU
Answer : Relatively hot objects
Explanation : We know that, the temperature of the objects is inversely proportional to their wavelengths. The objects emitting radiation in the visible region have short wavelength and hence are relatively hotter.
We know the range of wavelength of the visible spectrum is from 400 nm to 780 nm.