According to Paul Baltes and His Colleagues, Which of the Following

According to Paul Baltes and his colleagues, which of the following is an effective selection strategy?

A) If things don't go well for you, be willing to let others help you.
B) Persevere and keep trying until you reach your goal.
C) Focus on the most important goal at a particular time.
D) When things do not go the way they used to, search for other ways to achieve what you want.