Answer:
Brief.
Step-by-step explanation:
Prolonged means longer than usual or extended. So, going based on this..
- It can't be torn since that means something that is ripped to pieces or shreds. Something being longer than usual would have little to no (flipped) connection with that.
- Meek means shy.. Why would something being long have an opposite meaning submissive?
- Slack can mean many things, but for this let's just say it means that something's loose. Well, loose and long mean nothing similar, unless we're admitting that this has a lot of slack (no pun intended) and is hanging down pretty low, making it long. Unfortunately, it doesn't, so we'll have to scratch that out.
- Now, brief is out perfect match; it means short, and what is the opposite of short? Long! So, we have our answer:
The closest antonym for the word prolonged is brief.
Hope this helped! : D