Final answer:
The word 'disgruntled' means unhappy or dissatisfied, and in this context it refers to being angry.
Step-by-step explanation:
The word 'disgruntled' means unhappy or dissatisfied. In this context, it refers to being angry. The sentence 'The noise of the cacophony shrilled throughout the town. The sun glared harshly on the parade, and colorful streamers rained through the air like falling debris' emphasizes a negative and chaotic atmosphere, supporting the idea of being unhappy and angry. Therefore, the correct answer is d) Angry.