I believe your answer will be 3.
It will be D because that means stapler!!
Hay mas caballos que vacas (there are more horses than cows). Los caballos viven en la casa the horses live in the house). Hay setenta y cuatro animales (there are 74 animals). Hay setenta animales (there are 70 animals)
Si hoy es martes 29 de diciembre entonces jueves será el 31 de diciembre
I don't think the sentence would make any sense if you would have even tried to put any "tu" in the it.