Step 1: Understanding the Question Tag:
The correct question tag follows the auxiliary verb in the main sentence. Since the main sentence uses "take" in the present tense, the auxiliary verb "do" should be used in the negative form in the question tag: "don't you."
Step 2: Analyzing the Options:
- Didn't you: Incorrect because "didn't" is the past tense, while the sentence is in the present tense.
- Mustn't you: Incorrect because "mustn't" implies necessity, which doesn't match the context here.
- Won't you: Incorrect because "won't" is used for future or hypothetical actions, not present habits.
- Don't you: The correct choice because it matches the present tense of the main sentence.
Step 3: Conclusion:
The correct question tag is don't you, as it matches the present tense of the main sentence.