All of the following are among the causal factors to which individual's often attribute success or failure except:

A) attitude
B) task difficulty
C) ability
D) luck

Task Difficulty

Describes the level of challenge presented by a task, which can impact an individual's performance and effort required to complete it.

Attitude

A mental inclination characterized by the assessment of a specific entity in a manner that reflects either partiality or aversion.

Ability

The possession of the means or skill to perform a task or achieve an outcome, often acquired through practice or learning.