What are demographics?
a. trends regarding how the people within a society think and behave
b. conditions that prevent new companies from entering an industry
c. measures of various characteristics of the people who make up social units
d. the fixed costs that buyers face if they change suppliers
e. the lack of information needed to understand or predict the future

C. Measures of various characteristics of the people who make up social units

Step-by-step explanation:

Demographic data are alphanumeric data and have important practical applications for planning purposes such as projecting numbers of school-age children or workers of retirement age, diagnosis (infant, maternal mortality levels, etc.), assessment. socio-economic programs and studies in general (unemployment, poverty, housing, etc.).

but which class are u may know that first