At about what age does stranger wariness begin to decrease?

Zeke is reviewing a research study design for a co-worker. In it, he discovers a procedure that is questionable in terms of participant safety. For guidance, he turns to his academic discipline's:

policies and procedures. code of ethics. participant rules. conditions of liability.

In a national American study (Ward, 2008), what percent of older adults had at least one child who they saw several times a week?

a. 46% b. 58% c. 70% d. 82%