Answer:
D) It would move to the right 3.
Step-by-step explanation:
Given : If you subtracted 3 from the exponent in an exponential function,
To find : what would happen to the graph
Solution : We have given that exponential function
If we subtract 3 from power of exponent
Let parent function is 
Transformed function is 
By the Transformation rule f(x) →→f (x -h) it tell that graph of f(x) would shift right by h unit.
Hence , graph of
would shift right by 3 unit.
Therefore, D) It would move to the right 3.