Explanation:

- The original sentence uses "if you are liking it or not," which is incorrect because "liking" is not typically used in a continuous tense for preferences.

- Option 1: whether you have liked it - This suggests a past preference, which is incorrect in this context.

- Option 2: whether you like it - This is grammatically correct and straightforward for expressing preference in the present.

- Option 3: if you like it - While grammatically possible, "whether" is more suitable for binary choices.

- Option 4: No improvement - Not suitable because the original phrasing is incorrect.

Option 2: whether you like it is the most appropriate choice.