What is empiricism?

a. an early school of psychology concerned with the adaptive purpose of mind and behavior

b. a model of interconnected ideas or concepts that explains observations

c. observing and measuring phenomena relying largely on intuition

d. an approach to gaining knowledge about behavior and mental processes by observation and measurement only

d. an approach to gaining knowledge about behavior and mental processes by observation and measurement only

Explanation:

In philosophy, empiricism is a school of psychology that focuses in the way we gain knowledge and it establishes that we can only gain real knowledge by the information we get from our senses and experiences, in other words, empiricism gives importance to the empirical evidence that we gain from our experiences and therefore to the observations and measures we can do (instead of relying on reasoning and what our mind tells us)

Therefore, empiricism is an approach to gaining knowledge about behavior and mental processes by observation and measurement only.