Hence this word completes the sentence in meaning and option D is correct.
Option A: 'Sanctions' are 'threatened penalties for disobeying laws or rules'. It does not refer to delay of tax payment.
Option B: 'Refunds' refers to 'the repayment of money to a customer'. It does not refer to the taxes mentioned.
Option C: 'Fees' refers to 'money paid in exchange for advice or services'.
These words are not relevant in meaning and context. Hence options A, B and C are wrong.