4. ¿Viste a mis amigos en el cine?? Sí, __ vi. a) lo b) los c) las d) te

## Step 1<br />The problem is a fill-in-the-blank question in Spanish. The sentence is "¿Viste a mis amigos en el cine!? Sí, __ vi.". The blank needs to be filled with a word that refers to 'friends', which is a plural masculine noun in Spanish.<br />## Step 2<br />In Spanish, direct object pronouns are used to replace the noun that directly receives the action of the verb. In this case, the verb is 'vi', which means 'I saw'. The direct object pronoun that refers to 'friends' is 'los', which is the masculine plural form.<br />## Step 3<br />Therefore, the correct word to fill in the blank is 'los', which is option b).