F(x) = -9 + 10.3x probably. It's definitely not the first or last option as they have negative gradients (i.e. negative x-coefficient) and so represent a negative correlation. The data given tells us there is a positive gradient and so a positive correlation. It could be the second option as the second and third are not so vastly different but I would go for the third because it appears to most closely fit the data pattern.