<span>Did you protect the monkey? Yes, the monkey is already protected. Did you recycle the containers? Did you discover the path to the volcano? Did you keep the trees in the reserve? Did you pick up the flowers in the garden? Did you develop solar energy for the house?</span>
¡Hola!
empezar => yo empiezo (presente)
EMPEZAR <em>preterit tense</em>
yo empecé
tú empezaste
él/ella/Ud empezó
nosotros empezamos
vosotros empezasteis
ellos/ellas/Uds empezaron
☺☺☺
The answer is (a) because compro is bought in Spanish and in the question it says “yesterday he bought the gifts for his mother” so bought would be the best answer. (B) is to buy I guess like I will buy chicken. And (c) is like they bought chicken. How I know this is well I speak Spanish I hope this helps!