Jill noticed that her mother and sister both had characteristics of anxiety; hence she concluded that she might be at risk as well. This type of reasoning is consistent with which of the following approaches to studying the genetic basis of behavior?

a. adoption study
b. twin study
c. naturalistic study
d. family study

The correct answer is letter D

Explanation:  The family study is one of the most important structures, because from this it can constitute a good family base with the sharing of members through knowledge and thus share other factors as well. It plays a key role in mental health and significantly helps school performance.

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.