Answer:
Use in-house year purchase history data from the past 10 years, which contains consumer profiles. ( 1 )
Step-by-step explanation:
using an in-house database base as seen in this option the use of in-house year purchase history data from the past 10 years which contains consumer profiles will cost you less because the information you seek is already available in the consumer profiles so there would be no need conducting external surveys/research on consumers which would be a secondary source of data.
Other options listed like using an online commercial database that contains 15 years of e sports industry sales analysis and market profiles might as well provide the required information but this will be surely cost more than using in-house sources.( primary source )