ANSWER
B. Subtraction property of equality.
Step-by-step explanation
The given statement is:
If 5x + 2 = 2x + 11
Then, 5x = 2x + 9
By looking at the two equations, we will notice that the action that was carried out is that 2 was subtracted from both sides of the first equation to obtain the second equation.
Therefore, we see that the property that was used is the Subtraction property of equality.