To better understand bulimia among college students, a researcher lives in a female freshman dorm for the fall semester to observe and interview students about their stresses, attitudes, and eating behaviors. a limitation of this field study is

The correct answer is that the limitation of this field study "determining direction of causality would be difficult because data are correlation & so many factors affect real life situations, it would be hard to control all the variables that creates findings harder to interpret."
In the given situation, because of the many factors present in the study and it affects real life situations, which are uncontrollable, which is why this study has this kind of limitation.

6, 4, 5, 1 are true. the others are false.

True. you know, tools like shovels.