Explanation:

- The sentence mentions celebrities encouraging children. The verb "encourage" means to give support, confidence, or hope to someone.

- Option 1: Daunt – Means to make someone feel intimidated or apprehensive. This is the opposite of encourage.

- Option 2: Stimulate – Means to raise levels of physiological or nervous activity. It can also mean to encourage interest or activity. This is similar to giving children support to aspire to greatness.

- Option 3: Undermine – Means to damage or weaken someone or something. It contradicts encouraging someone.

- Option 4: Abate – Means to become less intense or widespread. This doesn't align with the definition of encourage.