If a time limit is long enough to allow test takers to attempt all items, and if some items are so difficult that no test taker is able to obtain a perfect score, then the test is referred to what kind of test

B. power

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.

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