Explanation:

Let’s break down each option for the word "Urge":

- Option 1: Reply — This means to answer someone. It’s not really close to "urge," which is about encouraging someone to do something.

- Option 2: Refuse — To say no or decline. Almost the opposite of urge; not a match.

- Option 3: Protest — To object or express disapproval. Again, it's more about disagreement, not motivating or persuading.

- Option 4: ?? Appeal — This is the closest in meaning. When you urge someone, you’re making a strong request or appeal. You want them to take an action.

- Option 5: (The list was only up to 4, but just covering if there’s a typo.)

So, the most appropriate synonym is definitely "Appeal." They both involve asking or encouraging someone in a serious way.