The diagram above shows a potassium atom. which is the second highest energy level? A. 1
B. 2
C. 3
D.4

Yes she is correct. the answer is completely correct

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.