Choose the best spanish translation. some yellow pencils los lápices amarillos los lápices amarillo unos lápices amarillos unos amarillos lápices

unos lápices amarillos

Unos =  Some

Làpices = pencils

Amarillos = Yellow*

The adjective is always after the noun ( not like in english)

Explanation:

Some yellow pencils.

A better translation is:

Algunos lapices amarillos.

The formal translation for "Some" is:

Some= Algún, Alguno, Algunos, Alguna, Algunas.

But in spanish you can replace Algún, Alguno, Algunos, Alguna, Algunas for un, unos or unas. It's less formal but it's acceptable.

Yellow= Amarillo/Amarilla, Amarillos/Amarillas.

Pencils= Lapices.

Finally keep in mind that contrary to english, in spanish the adjective comes  after the noun. Therefore the best translation from the choices given is:

Unos lápices amarillos