Answer:
c)
Step-by-step explanation:
Physiology has to do with the functions and activities of life or of living matter (such as organs, tissues, or cells) and of the physical and chemical phenomena involved.
One of the main problems that the study of personality deals with is how to measure it, since most of the time, the measures are not standardized or they are not reliable.
A physiological approach to personality has the advantage that can be measured mechanically and reliably (since it has to do with physical and chemical process). Therefore, the correct answer is C.
Note:
a) is not correct because physiology is not necessarily easy to measure.
b) is not correct because physiology is not actually the most important part of personality.
d) Although it refers to common chemical phenomena, it's not the same for all people.