Explanation:

- Voracious is an adjective used to describe an eager approach to an activity. It often implies an insatiable hunger, whether for food or another pursuit.

- Option 1: Greedy

- Means having or showing an intense and selfish desire, especially for wealth or power.

- Relates to having a large appetite or desire, similar to voracious.

- This is the correct synonym for voracious.

- Option 2: Restrained

- Means characterized by reserve or moderation.

- Opposite of having a large appetite or eagerness.

- Not a synonym.

- Option 3: Moderate

- Suggests avoiding extremes, a balance or average stance.

- It doesn’t describe a strong desire or appetite.

- Not a synonym.

- Option 4: Truthful

- Relates to honesty and correctness.

- Unrelated to eagerness or appetite.

- Not a synonym.