Emre marks a point on the x-axis of the Cartesian coordinate plane in a mathematics class activity. Then, by decreasing the x-coordinate of this marked point by 1 unit and increasing the y-coordinate by 3 units, he obtains a second point, and when he applies the same operation to the second point, he obtains a third point on the y-axis.
What is the sum of the coordinates of the fourth point that Emre will obtain by applying the same operation to the third point?
A) 4
B) 5
C) 6
D) 7
E) 8