Answer :
Answer:
Secondary analysis.
Explanation:
A secondary analysis is a new analysis of already analised data by a new researcher, usually to ask new questions. In this case, Asher is re-analysing a study made by the U.S. Centers for Disease Control and Prevention about the effectiveness of the Gardasil vaccine. Asher picks already gathered data by the CDCP and uses it for his study, providing a secondary analysis.