Answer:
B - ESCRIBE
Step-by-step explanation:
In Spanish, the form of the verb "escribir" (to write) changes depending on the pronoun used as the subject of the sentence.
When addressing someone formally in Spanish, we use the pronoun "usted" (you, formal) and the correct conjugation of "escribir" for this pronoun is "escribe". This is why we say "escribe usted" (you write) and not "escribes usted" (you write, informal), "escribo usted" (I write, formal) or "escriben usted" (they write, formal).
The reason for this is that each pronoun has its own conjugation for the verb "escribir" in Spanish. The pronoun "yo" (I) uses the conjugation "escribo", while the pronoun "tú" (you, informal) uses "escribes" and the pronoun "ellos/ellas" (they) uses "escriben".
In summary, "escribe usted" is the correct form of the verb "escribir" for the formal singular pronoun "usted" in Spanish.