you have given a function for the first one and some points for the second function 
But you don't have the second function 
So heres how you do it ..
Substitute the X values given for the second function and substitute in first 
You will get a number as a result witch is the value of Y or g(x) for first function 
Also the y value for second function is already given so you can compare between them .. 
Hint : the x's are the same so you can only compare the Y's
Since both have two points thats smaller than the other look for the smallest value witch is ( (0,3 ) so
The correct answer is the last option