Which of the Following,suggested by Baltes and Colleagues,is a Selection

Which of the following,suggested by Baltes and colleagues,is a selection strategy for older adults?

A) To achieve something,you may need to be patient until the right moment arrives.
B) Think about what you want in life and commit yourself to one or two major goals.
C) When things do not go the way they used to,search for other ways to achieve what you want.
D) Keep working on what you have planned until you are successful.