The correct answer would be A.
Why? Well you have to look at the conjunctions for each word. The first subject is “Los Abuelos” just by looking at the word “Los” you can tell it is plural, therefore there is more than 1 Abuelo, or grandparent. The conjunction for “Los” in this situation would be empiezan. The subject is “usted” which means you. The conjuctuation for this would be Piensa. And so the answer is A! Hope this helps.