A Number of People in Toshi's Family Struggle with Anxiety

A number of people in Toshi's family struggle with anxiety attacks. He has been fortunate in that he has never had a problem with anxiety. However, when his parents suddenly announce that they are going to be divorced, Toshi is shocked and upset. A week later, sitting in class, he has his first anxiety attack. If we use the three levels of analysis, we can say that Toshi's anxiety is

A) primarily a biological problem.
B) primarily a psychological problem.
C) primarily an environmental problem.
D) due to an interaction among all three levels.
E) primarily a perception problem.