This can really be answered by others. This question is asked direcly to YOU. If you are unsure of the identification portion, it helps to google the terms, and based off what you looked up, you should be able to determine if your response fits in with any of these. Best of lock to you!
Answer:
Within-Subjects Experiments
Explanation:
Within-Subjects Designs: this is a form of experimental design in which the participants involved is exposed or subjected to all the conditions.
However, in this case, Alberto, is using Within-Subject Designs (simultaneous) by exposing all the participants to answer arithmetic problems while listening to metal, and then country, and finally classical music simultenously.
The multiple conditions here are: arithmetic problems to solve, listening to different types of music in a sequence that mixed the different types.
I think A)People had more time for face to face contact