Answer:
c. demographic
Explanation:
Demographic analysis may be defined as a method or a technique which is used to generate an understanding of basic characteristics such as sexual orientation, racial composition, religion and age of the population and how it has evolved over time.
Thus in the context, when Amanda uses a technique to analysed her audiences in terms of age, cultural background and gender, she is engaged in the demographic analysis of the audience.
The the correct answer is --
c. demographic