Yo traje un libro y un lápiz para la escuela hoy.
Ayer fui a la escuela, y tuve un examen en clase de español.
Spanishdict is a good website for translating too
The answer is D. un.
Làpiz is a masuline word in Spanish, so "la" and "una" cannot be used since those are feminine. "Los" is also incorrect since that is the plural form, which is not being used in the sentence. Therefore, un is the correct choice.
