Which of the Following Statements Is Most True of the Vulnerability-Stress

Which of the following statements is most true of the vulnerability-stress model?

A) The vulnerability-stress model is based on a genetic mutation that results in abnormal behaviours
B) The vulnerability-stress model is based on psychological factors that exacerbate biological symptoms
C) The vulnerability-stress model suggests that the vulnerability can be either biological or psychological
D) The vulnerability stress model suggests that environmental stressors must always be biological