Explanation:

- The statement: "There is a feeling of disenchantment among the members of the group." This suggests a loss of charm, enthusiasm, or faith.

- Option 1: Delight: This means great pleasure or joy. It contrasts with disenchantment, as the latter implies a negative feeling.

- Option 2: Disappointment: This means sadness or displeasure caused by the non-fulfillment of one's hopes or expectations. It aligns with disenchantment, as both suggest a letdown.

- Option 3: Idealism: This means the pursuit of high or noble principles, purposes, or goals. It does not match the notion of disenchantment.

- Option 4: Unrelenting: This means not easing or slackening in severity. It is unrelated to a loss of belief or enthusiasm.