Drawing Inferences and Conclusions Directions:   Read the Following Passage

Drawing Inferences and Conclusions Directions:   Read the following passage. Then select the appropriate letter to identify the inference readers need to draw from the text to fully understand the authors' meaning.
¹What makes a young person a potential candidate for suicide?  ²It's hard to say since suicide is a complex behavioral pattern determined by biological, psychological, social, and environmental influences. ³Our knowledge tends to be limited because of the difficulties associated with studying suicidal behavior. ⁴But there are some things that we do know. ⁵Many teenagers who commit suicide do so following acute experiences of  punishment, rejection or humiliation. ⁶Revenge or anger may also play a role. ⁷When young adults commit suicide, the target of their anger is often parents, a romantic partner, or someone else who may have rejected the person contemplating suicide. ⁸Some young people also threaten suicide to manipulate the behavior of those around them. ⁹Others view suicide as a way of atoning for some previous sin.
Adapted from Kathleen D.Mullen et al., Connections for Health , p.327
In line 3, the authors expect readers to mentally fill in what phrase after the word knowledge ?

A) of what causes suicide
B) of what makes a young person consider suicide
C) of how parents view suicide