Help with all of the options pleaseee

o-u : durmió , durmieron (3rd person singular and plural )

 e-i : repitió , repitieron (3rd person singular and plural )

e-i : prefirió , prefirieron (3rd person singular and plural )

i-y : leyó , leyeron (3rd person singular and plural )

i-y : se cayó , se cayeron (3rd person singular and plural )

 e-i : sirvió , sirvieron (3rd person singular and plural )

The –ir verbs that change the stem in the present tense (dormir, repetir, preferir, servir), in the preterite, they only change the stem in the 3rd person singular and plural and they always follow the same pattern. The "o" changes to "u" or the "e" changes to "i".

If the stem of an –er verb ends in a vowel, you need to change the ending for the 3rd person (singular and plural) in the preterite: The "i" changes to "y".

b.

explanation:

just because.

well, the b sentence is the only one that has sense.

hermano limpia el cuarto y dobla tu ropa.

hermano haz la tarea.

hermano come tus verduras.

hermano lee tu libro.

hermano lava el pero