When the relationship between a test and performance is low in a concurrent study, one likely reason may be:

Restriction of range  

Explanation:

In concurrent study, the test is administered and the criteria is being measured at relatively about the same possible time.  

The test results may not correlate with the performance data because there may be a restriction of the range occurrence.

This is the main reason for the low relationship between the performance and test.

So, the correct answer is " Restriction of range".

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

2b2t

explanation:

2b2t