Answer:
<em>Reliability testing </em>
Explanation:
<em>In psychological research,</em><em> the term reliability testing is defined as one of the methods which are being used to describe the consistency of a particular study or research or measuring tests. In other words, it is described as the extent to which a particular assessment tool can produce consistent and stable results. </em>
<em>Reliability testing</em><em> makes sure that the response from a particular test must remain the same even after being conducted or measured after some time.</em>
I think the answer is self employment income but that is if your selling something and receiving money for it on your own time(not at a workplace)
The correct answer is (B) barometer