Your explanation that your social commitments tie you down, does not convince me.

The correct answer is obligations.

• Reduction means to make something smaller or less in amount, number, or degree.
• Depletion means to use up or reduce something until there is very little left.
• Restrictions are rules or limitations that prevent someone from doing something.
• Obligations are things that you are required
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  or expected to do.

In the context of the question, the speaker