Which of the Following Represents the Most Serious Need for Crisis

Which of the following represents the most serious need for crisis intervention?

A) A person confides in a friend the details of a feasible plan for killing himself with carbon monoxide.
B) After surviving a car accident, a young man takes up several high-risk activities, including hang gliding.
C) After weeks of depression, a woman abruptly gives away a book autographed by her favorite author.
D) The most serious sign is no sign at all, since most people give no warning before attempting suicide.