A sharp knife is used to cut meat. In case you want to use cutting then you can reframe the sentence like 'A sharp knife is used for cutting meat.'

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b.) to cut

b) to cut

B. to cut Because normally, 'to' goes with a verb (as part of the infinitive form), not a noun. If, however, the 'to' is a preposition that is part of a combination, then it is OK to use a gerund (-ing) after 'to'.