Which rule yields the dilation of the figure QRST centered at the origin?

Question

a (x, y) → (3x, 3y)
b (x, y) → (1/3 x,1/3 y)
c (x, y) → (x + 3, y + 3)
d (x, y) → (x + 1/3, y + 1/3)

Answer 1

a (x, y) → (3x, 3y)