Which verb form correctly completes this sentence?

¿tú cuál es la mejor opción para llegar a la playa?

a.
investigó
b.
investigaste
c.
investigamos
d.
investigaron

¿Tú investigaste cuál es la mejor opción para llegar a la playa?

so what i did was i used google translate and this is what i got. where do you live? what do you do in your free time? what kind of music, food, sports do you like? what is your favorite color? who is your favorite artist? so what they are doing is asking u questions about urself and u have to respond in spanish or english i bealive. hope this : )