It is the number yes because it’s yes and it’s not no
Hey there!
The answer is A. empiezan; piensa
“Los abuelos” translated to english is “The grandparents” so you have to use the proper ending of the word. Since it’s more than one person C and D automatically become eliminated. Then you just have to check the correct spelling.
Hope this helps !
La unidad elemental de todo ser vivo es la célula.