At t = 0, a particle leaves the origin with a velocity of 9.0 m/s in the positive y direction and moves in the xy plane with a constant acceleration of (2.0i - 4.0j) m/s2/2. At the instant the x coordinate of the particle is 15 m, what is the speed of the particle?

a.12 m/s

b.14 m/s

c.10 m/s

d.26 m/s

e.16 m/s