Hey there!
There's a special rule in Spanish when a noun ends with a z. When you make it plural, it does not end with a traditional -os or -as. It ends with -ces. For example, pez turns to peces, and so on.
Therefore, your answer would be "Los lapices".
Hope this helps!
Answer: Mi hermano estaba hablando por teléfono cuando mi mamá entro a su habitación.
