Final answer:
The correct verb form to complete the sentence 'alojarme en un albergue juvenil' when the subject is 'Yo' is 'A. preferiría'.
Step-by-step explanation:
The correct verb form to complete the sentence 'alojarme en un albergue juvenil' when the subject is 'Yo' is 'A. preferiría'. This is because 'preferiría' is the conjugation of the verb 'preferir' in the first person singular (Yo form) in the conditional tense. In this context, the use of the conditional tense expresses a hypothetical or uncertain action, indicating that the speaker would prefer to stay in a youth hostel. For example, 'Yo preferiría alojarme en un albergue juvenil si el hotel es demasiado caro.' (I would prefer to stay in a youth hostel if the hotel is too expensive.)
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