Which of the Statements About Demography Is Most Accurate? Demographic

Which of the statements about demography is most accurate? Demographic studies:

A) focus on factors that have great political relevance, but little relevance to business firms.
B) suggest that the number of single-parent families will decline in the future.
C) provide businesses and individuals with insights into business and career opportunities for the future.
D) are an important source of information about changes in health patterns.