Explanation:

Here’s the thing—let’s break down each word:

- excavation: This one’s spelled right. It means digging up something, like an archaeologist does at a dig site.

- elocution: That’s proper too. It refers to speaking clearly and effectively, like what a public speaker aims for.

- evecuation: This is the odd one out. It’s a misspelling of “evacuation,” which means leaving a place for safety.

- evocation: Totally valid. This word’s about bringing to mind a feeling or memory.

So, the wrongly spelled word is:

- Option 3: evecuation