Answer:
 1, 4, 3, 6, 2, 7, 5
Explanation:
The circle operator in 
 means that the function named on the left (f) operates on the result of the function named on the right (g). So, the notation
 means that the function named on the left (f) operates on the result of the function named on the right (g). So, the notation
 

means
 

That is, g(x) is computed and used as input to the function f. When the function definitions are as shown, the evaluation proceeds in these steps.
 

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If your step choices at the bottom are numbered 1 to 7 left-to right, then the sequence is as shown in the Answer section above.