Respuesta :
Hi
CORRECT ANSWER = 3
Yo sé dónde ir de compras. (I know where to shop)
saber
sé
sabes
sabe
sabemos
sabéis
saben
The third option is best, though the second option is not incorrect, although wird-sounding. The first and last options are incorrect grammatically and orthographically respectively.
Hope it helped,
Happy homework/ study/ exam!