How would you make the word book plural? a. els libros b. los libros c. el libro d. la libro

I would make the word book plural in Spanish:

Explanation:

In Spanish the articles and nouns have gender and number, therefore we must identify these two data of the word "libro" in Spanish:

By this reason, you must use an article that be male and plural for its plural form:

As you can see, the right option is "los," by another side, the plural in Spanish regularly is formed adding "s" at the end of the word, in this case, the plural form of "libro" is "libros."