When you're talking about nonspecific things.
it's like (a) and (an) in english.
uno is for singular masculine.
una is for singular feminine.
unos is for plural masculine.
unas is for plural feminine.
If im im right, the answer should be
B-Interesamos. Because that is the conjugation of nosotros.
-Steel jelly.
<span>setecientos treinta y cinco
</span>