The correct modal verb to use in the given sentence 'Dad...time' would be:
a). Must
- Modals or modal verbs are characterized as auxiliary verbs that function to express the mood in a sentence grammatically.
- This mood expresses whether the sentence offers a suggestion, advice, obligation, order, ability(capacity), necessity, etc.
- In the given sentence, the speaker talks in an obligatory or responsible mood because it is his duty to take care of his health to consult a doctor to get himself checked and get treated on time.
Thus, option a is the correct answer.
Learn more about 'Modal Verb' here:
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