In an "Atom Smasher," Two Particles Collide Head on at Relativistic

Multiple Choice

In an "atom smasher," two particles collide head on at relativistic speeds.If the velocity of the first particle is 0.741c to the left,and the velocity of the second particle is to the right (both of these speeds are measured in Earth's rest frame) ,how fast are the particles moving with respect to each other?

A) 0.866c
B) 1.091c
C) 0.883c
D) 0.788c