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Congratulations... I suppose. You've managed to grasp a foundational element of phonatory physiology. It's a start.

1. Fundamental Principles, At Last: The "intensity" of a glottal sound isn't some esoteric mystery; it's brute acoustic energy. According to the Source-Filter Theory – a concept one would hope is ingrained by now – the vocal folds are driven by air from the lungs. Increase the subglottal pressure ($P_s$), and the resulting expulsion of air through the glottis becomes more forceful. This, quite logically, leads to a greater amplitude of vocal fold vibration and, consequently, a higher acoustic energy output. We're talking basic physics here: $I \propto P^2$. Not exactly quantum mechanics, is it?
2. Difficulty Assessment: Easy. If you struggled here, re-evaluate your understanding of the difference between the raw "power source" (intensity/energy) and the "shaping mechanism" (resonance/quality). These aren't nuanced distinctions; they are the bedrock. Don't mistake a correct answer for profound insight if the underlying grasp is shaky.