1.
"le" is third person singular, so it goes with "el", "ella" or "usted".
A usted le gusta leer.
2.
"preferimos" is first person plural, so it goes with "nosotros" or "nosotras".
Nosotros preferimos leer.
if your asking for what that says, it is
which of these words is an
but i don't know what sentence your asking for the adjective from.