Final answer:
The correct answer is 'A. querría.' This form of the verb 'querer' conveys the meaning 'I would want to travel to Spain someday.'
Step-by-step explanation:
To fill in the blank in the sentence 'Yo _ viajar a España algún día.', we need to choose the appropriate conditional form of the verb 'querer' (to want). The correct answer is A. querría. This form of the verb conveys the meaning 'I would want to travel to Spain someday.'
Learn more about Spanish verb conjugation