Answer & Explanation
A) One question you should always ask yourself: “Am I pleased with the results?”
The second would employ a comma, or semi-colon, and not a colon so it is not properly punctuated.
The third sentence would not be correct because it uses 'like', usually used for comparison. Since you are not comparing two questions, it would not be appropriate.
The fourth sentence has 'is' before the colon, which is a implies declaration and not listing. So, again, it would not be appropriate.
Hence, the first sentence, however, is punctuated correctly.