Answer: Choice C (lower left corner)
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Explanation:
"one and a half" can be represented by 1.5 because 0.5 = 1/2, so this means that we have 1.5 times
leading to the function 
At this point, we have a choice between B and C based on the function we just found. However, we can rule out choice B because the point (0,0) is not on the function curve. Note how plugging in x = 0 leads to
y = 1.5*sqrt(x)
y = 1.5*sqrt(0)
y = 1.5*0
y = 0
So this proves how (x,y) = (0,0) is one point on the function curve. Only choice C fits the description.