ANSWER
A reflection over the y-axis followed by a dilation by a factor greater than 1
Step-by-step explanation
We can see from the diagram that, square M and square P are all equal distance from the line y-axis.
This means that square M has been reflected in the y-axis.
Since square P is greater than square M, there has been a multiplication by a scale factor greater than 1.
The correct choice is B.