Every year, Jordan buys a calendar to keep track of his appointments and events. However, this year, he bought a smartphone that has a built in calendar, so he did not buy a new paper calendar. Which psychological variable does this scenario most closely describe

Learning

Explanation: Changes or increase in an individual's scope of events, level of knowledge of certain subjects resulting from experience over time is called learning. Learning could be observational, classical conditioning or operant conditioning as stated by various authors. Jordan's decision to purchase a smartphone instead of a calendar which has previously been his tool for keeping track of events is most closely related to learning as his option this year might be due to observation of others adhering to a more technologically efficient means of keeping track of events while also maximizing and taking advantage of other benefits attached to the use of a smartphone.

i would say b. research typically uses a variety of sources