Answer:
a. an inventory
Explanation:
An inventory -
It refers to the psychological form of test , where the person without any external help , need to perform the test , which is in the form of questionnaire or survey , is referred to as an inventory .
The test is used to analyse the ability of the person in a better manner .
The factors like , knowledge , behavior , values , interests and personality can be determined by this method .
Hence , from the given scenario of the question ,
The correct option is a. an inventory .