Investigators exploring the so-called "mozart effect" have suggested that one very simple explanation for the phenomenon is that listening to classical music, like any other stimulating activity, enhances arousal in children. this "simpler" explanation demonstrates the principle of

Occam's Razor

Explanation:

            "Mozart Effect" was first used by Alfred A. Tomatis, who used to listen to Mozart's music and found positive outcomes to the cure of many disorders. It is believed that listening to such music will improve the performance of  young kids when doing mental tasks.

             Occam's Razor is the philosophical or analytical principle which is used to decide the credibility of statements. In simple words, the lesser assumption needed to prove a phenomenon, the more accurate is the phenomenon.

            Hence the explanation that the investigators explored about "Mozart Effect" demonstrates the principle of Occam's Razor

Thus the answer is "Occam's Razor".

is there multiple choice or do you need like an essay answer?