Which of the Following Most Accurately and Completely Describes the Factors

Which of the following most accurately and completely describes the factors that typically complicate retirement income planning?

A) uncertainty as to the future increases in the cost of living, uncertainty as to which spouse will die first, and uncertainty as to how long a person will live,
B) uncertainty as to the future increases in the cost of living, uncertainty as to which spouse will die first, uncertainty as to how long a person will live, and the coordination of benefits from various sources, such as Social Security, employee retirement plans, part-time earnings, investment income, etc.,
C) uncertainty as to the future increases in the cost of living, uncertainty as to which spouse will die first, and the coordination of benefits from various sources, such as Social Security, employee retirement plans, part-time earnings, investment income, etc.,
D) uncertainty as to how long a person will live and the coordination of benefits from various sources, such as Social Security, employee retirement plans, part-time earnings, investment income, etc.