Card sorting is a user research technique used to help design or evaluate the information architecture of a site or product. It involves participants organizing topics into categories that make sense to them and labeling these groups.
Key benefits of card sorting:
Simple and quick to conduct
Gathers early user input and validation
Helps understand how users group information naturally
Explanation of Other Options:
(A) Shadowing: Observing users silently to understand behavior.
(B) Focus group: Group discussions to gather opinions.
(D) Survey: Questionnaires used to collect data from many users.
Therefore, the correct answer is option (C).