Answer:
Intensity
Step-by-step explanation:
It should be understood that, intensity can be described or explained as the components of motivation which involves focusing one's energy and mental effort and applying them toward the task at hand.
In this case, the reasons why Ahmed did not know that two hours had gone by, and did not hear the phone ringing was because he focused and applied all his energy and mental effort to that particular sculpture he was working on. And this is known as intensity, which is a component of motivation.