Final answer:
The word you would most likely not traer a una is 'El ratón.'
Step-by-step explanation:
The correct answer would be OB. El ratón.
In Spanish, nouns have genders. Masculine nouns typically use the article 'el' and feminine nouns typically use the article 'la.'
'La guitarra' is feminine, 'las galletas' is feminine plural, and 'los refrescos' is masculine plural. However, 'el ratón' is a masculine noun, so it would not typically be preceded by the article 'una.'
Learn more about Masculine and feminine nouns in Spanish