The correct answer is A. Online surveys, as stated in the uploaded study guide. The decisive factors are scale, remote participation, and the relatively straightforward nature of the information being collected. Online surveys can efficiently gather structured feedback from hundreds or thousands of participants without requiring a researcher to observe every session. They are especially effective when questions concern relatively concrete behaviors, preferences, experiences, or task-related feedback that can be expressed through predetermined choices, ratings, or concise responses. A usability study is more appropriate when the designer needs to observe users completing tasks and understand where participants encounter confusion, friction, errors, or navigation difficulties. It produces richer behavioral evidence but generally requires substantially more research effort. A/B testing compares two or more variations of an experience against a measurable behavioral outcome. It answers questions such as which version generates more clicks or successful conversions; it is not primarily a general-purpose feedback collection technique. Because the scenario specifically requires feedback from hundreds of remote users and does not demand substantial emotional exploration or imaginative discussion, a scalable quantitative or structured method is appropriate. Online surveys therefore provide the strongest balance between reach, speed, consistency, and research effort.
Study Guide reference/topics: Online surveys, remote research, research scale, usability methods, Testing.
==================================
