Durante el verano pasado, todas las tardes la dueña de la joyería abre la tienda después de la siesta abría la tienda después de la siesta abrió la tienda después de la siesta

The right option that fills the blank is:

- Durante el verano pasado, todas las tardes la dueña de la joyería abrió la tienda después de la siesta.

Explanation:

The translation of the paragraph is:

- During the last summer, every afternoon the owner of the jewelry store opened the shop after the nap.

Since the tense used in the paragraph is the Preterite, two forms of the conjugated verb "abrir" could be used at that time:

However, you should know that Perfect Simple Preterite is used when the time of the action is defined and the Imperfect Preterite when the time at which the action is performed is not defined. As the sentence mentions that the action occurs during the last summer and every afternoon, the time is defined and therefore the form of the Perfect Simple Preterite "abrió" is used.