Select the word that is most opposite in meaning to the highlighted word: DISCORD

The correct answer is Harmony.

Step 1: Understand the meaning of the given word
The word DISCORD refers to a lack of agreement, harmony, or peace between people or things. It often denotes strife, conflict, friction, or unpleasant, harsh sounds (dissonance).

Step 2: Analyze the given options
1. Turmoil: Means a state of great disturbance, confusion, or uncertainty. This is similar in meaning (synonymous) to discord.
2. Din: Means a loud, unpleasant, and prolonged noise. This is related to acoustic discord or commotion.
3. Commotion: Means a state of confused and noisy disturbance. This is also a synonym or closely related word to discord.
4. Harmony: Means agreement, concord, or a pleasing combination of elements/sounds. This represents the exact opposite condition of conflict or noise.

Conclusion:
Since the question asks for the word that is most opposite in meaning (an antonym) to DISCORD, Harmony is the correct choice.