Which command best completes this conversation between eva and laura?
laura: ¿puedo usar tu computadora portátil?
eva: sí, claro, ¡

usarla

úsala

úsela

úsenla

The correct answer is úsala.

Explanation:

Laura: ¿Puedo usar tu computadora portátil?

Eva: Sí, claro, ¡úsala!

This means:

Laura: Can I use your laptop?

Eva: Yes, of course. Use it!

"Úsala" is imperative, but in this case it implies "of course, go ahead". "Úsela" is also grammatically correct but it is used in formal language. For instance, if Laura was Eva's boss or someone she doesn't know very well, she would answer using "úsela". "Usarla" is grammatically incorrect. And "úsenla" would be ok if it was directed to a group of people instead of Laura only, because it's plural.

spanish: guatemala es genial, hay grandes amaneceres y puestas de sol. la plaza del pueblo es muy acogedora y tiene muchas tiendas divertidas. ¡no puedo esperar a verlos a todos cuando llegue a casa!

english: guatemala is great, there are great sun rises and sunsets. the town square is very welcoming and has lots of fun shops. can't wait to see all of you when i get home!