Choose the most suitable option to replace the bold part of the sentence: I am used to get up early every morning.

 The correct option is (c). In the sentence, the expression am used to shows a habit or familiarity. After used to , we use a noun or a gerund (verb + ing), not the base form of the verb. Therefore, to get up is incorrect here because it uses the infinitive form. The correct replacement is to getting up, which makes the sentence grammatically correct: I am used to getting up early every morning. Grammatical rule used: Be used to + noun/gerund (habit/familiarity). It is different from used to + base verb, which refers to a past habit. Example (rule): She is used to working late at night.