Answer:
C. ¡Buen día!
Explanation:
Since it is a matter of responding to a "formal" email, <u>idioms</u> or <u>barbarities</u> should not be used. Option B could be, but I would use it more on cards.
El ratòn está detractors del teclado
Yo
Necesito un libro para la clase de inglés---Yo
