Answer:
B. power
Step-by-step explanation:
The power test is a statistical computation that is performed prior to the study to calculate the minimum size of the sample required for the study
Since in the question it is mentioned that in the case of more time limit the test takes could attempt all the test but if some items were difficult so it would not be possible to have a perfect score
So this test represents the power test
Hence, the correct option is B.