Question

piensan cerrar la tienda a las ocho. los piensan cerrar. lo piensan cerrar. la piensan cerrar. las piensan cerrar.

Explanation:

The original sentence is "Piensan cerrar la tienda a las ocho." ("They plan to close the store at eight.") The direct object is "la tienda", a feminine singular noun. In Spanish, when replacing a feminine singular direct object with a pronoun, we use "la" to agree in gender and number.

Answer:

La piensan cerrar.