What is a group whose values, norms, and beliefs come to serve as a standard for one's own behavior?
secondary group
formal organization
reference group
primary group

The correct answer is C. Reference group

Explanation:

In sociology, society and interaction are studied according to different groups that include primary groups that imply a close and long-term relationship; secondary groups that are those the individual interacts mainly in an imp personal and limited way and reference groups that are peer groups that serve to the individual as standard in terms of behaviors, norms, beliefs, among others this includes groups such as classmates, relatives, co-workers, among other. Considering this, ti can be concluded the group whose values, norms and beliefe serve as a standard for one's own behavior is the reference group.

i am confused, what is the question? i can you out if you put it into more depth.

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

explanation:

productive can also mean:

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