No, it is not a correct sentence.
The mistake is in the word <em />worse - you need to use the superlative (final) form of the adjective. Bad - worse - worst. So the correct answer would actually be:
Deciding to go to Barcelona was the worst decision I ever made.
There is nothing to pick from. Sorry, I could've helped!
Answer:
You will have to explain yourself a bit more
Explanation: