Availability concerns occur when legitimate users are unable to gain access to systems or information. The major types of availability disruptions are denial of service, power outages, hardware failures, destruction, and service outages.

Confidentiality concerns occur when unauthorized individuals may be able to gain access to sensitive information. Making it an incorrect answer here.
Integrity concerns occur when there is the potential for unauthorized modification of information. The major types of integrity attacks include man-in-the-middle attacks, replay attacks, impersonation and unauthorized information alteration. Making it another incorrect answer.
Nonrepudiation is a security goal that prevents someone from claiming that they did not send a message or engage in an activity. Nonrepudiation is commonly implemented by using digital signatures. So that is another incorrect answer.