Answer:
Nuestra abuela es muy simpática. Siempre <u><em>nos</em></u> da galletas y leche cuando le visitamos.
Explanation:
The direct object pronoun should take into consideration the personal pronoun with which you’re beginning the sentence. In this case, when you begin with “<em>Nuestra</em>” you must use the direct object pronoun “<em>nos</em>” which always corresponds with “nuestro”, “nuestros”, “nuestra” and “nuestras”.
The rest of the options are better used in the following cases:
“<em>Me</em>”: When the sentence begins with “<em>yo</em>” or when making reference to the first person.
“<em>Te</em>”: When the sentence begins with “<em>tú</em>” or when making reference to the second person.
“<em>Les</em>”: When the sentence begins with “<em>ustedes</em>” or “<em>ellos</em>”, or when making reference to the second person of the plural (except when using the personal pronoun “<em>vosotros</em>” which is only used in Spain) or the third person of the plural.