Final answer:
In Spanish, verb endings provide information about the subject, enabling the omission of pronouns to convey the same meaning effectively.
Explanation:
In Spanish, the sentence 'Yo compré un libro nuevo' ('I bought a new book') often drops the pronoun 'Yo' because the verb ending '-é' indicates the first person singular, making the pronoun redundant.
Therefore, the correct completion for the sentence 'Yo___ una crema solar' would be a) usé (used) as it matches the first person singular form indicated by the verb ending.
Understanding verb conjugation in Spanish helps in identifying the appropriate pronoun usage in sentences.
Learn more about Spanish verb conjugation and pronoun usage here:
https://brainly.com/question/28441373
