18 data points are plotted below. They are modeled well by a function of the form 𝑓𝑥=𝑎+log𝑏𝑥. What base logarithm would be most appropriate?
(A) 𝑏=2 
(B) 𝑏=3 
(C) 𝑏=4 
(D) 𝑏=5