Answer:
B. PRIVACY
Explanation:
Almost all of modern mobile and web apps enable that private information be used to offer additional functionality for their consumers.
However minimum security knowledge between programmers may enable such sensitive information to be treated inappropriately.
Violation of the privacy happens whenever confidential information reaches the server / database of the system and is obtained or exploited inappropriately by unauthorized perpetrators.
Jon is unauthorized to access Kelsey's data, in this case, e-mail and Web site visits, for his personal gain.