(Originais Teachy 2023) - Question Medium of Spanish

During a science class, 2nd-grade elementary school students are learning about the importance of recycling for the environment. Teacher Pedro decided to create a game to help students better understand the classification of recyclable and non-recyclable materials. In the game, he writes on a poster the words 'paper', 'plastic', 'glass', 'metal', 'cardboard', and 'wood'. Each word is represented by a sequence of letters that form a specific sound when pronounced. The teacher asks the students which of these words belongs to the group of non-recyclable materials, knowing that the correct answer involves identifying the grapheme corresponding to the phoneme 'n'.