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".

the right answer is c. tiempos

el partido de fútbol tiene dos tiempos

in english, this translates:

a football match has two halves

these halves cosists of 45 minutes each.   each half runs continuously. on the other hand, there is usually a 15-minute half-time break between halves.  

the answer to your question is,

puerto rico

-mabel < 3