A researcher who studies how people form judgments about other people's characteristics and motives, as well as the mental processes by which people make sense of their social environments is most likely a(n) psychologist.

A researcher who studies how people form judgments about other people's characteristics and motives, as well as the mental processes by which people make sense of their social environments is most likely a social psychologist.

Explanation:

These professionals dedicate their work to those processes that are associated with human behavior when living with one another.Social psychologists understand psychology as the general behavior of a group of people (masses). In addition, they look not only at people, but also to the environment in which individuals live.The key concepts for these professionals are concepts that arise from relationships between people, whether they are between individuals or a complete group.

The answer would be age 18.