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.
Sentence 1: Opinion
Sentence 2: Fact
Sentence 3: Fact
Sentence 4: Fact
Sentence 5: Fact
Sentence 6: Fact
Remember, a fact is a statement that can be proved to be true and opinions are what people think.
Answer:
No paragraph
Explanation:
You need the paragraph to understand the context of the word.