The of research findings are what advanced the field of psychology

The answer to blank space is "accumulation".

Psychology is the exploration of behavior and psyche, grasping all parts of cognizant and oblivious experience and also thought. It is a scholastic discipline and a sociology which tries to comprehend people and groups by setting up general standards and investigating particular cases.

Iwould say the answer would be b

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.