Mi hermano esta estudiando
Valentina y Ana son Guatemalecas
La cocina de mi amiga es desordenada
El comedor de mis abuelos es grande
El espejo esta roto
The answer would be A) Intensity. Because, You are pushing your body to get in all the training it needs in a short amount of time by intensifying the workout.
Answer: Tenio
(Or another possible anserw is tuvo)