For most people, the most important consideration in when to retire is whether
a. they like their boss.
b. they are tired of working.
c. they will be financially secure.
d. they need more job training.

For most people the decision whether to retire or not is taken with consideration of the question whether they will have a secure livelihood after they retire - the correct answer is C. they will be financially secure.

They want to be sure that they don't need to worry about finances when they retire and they they can cover their expenses.