The drawing shows four situations in which a positively charged particle is moving with a velocity v_(vector) through a magnetic field B_(vector). In each case, the magnetic field is directed out of the page toward you, and the velocity is directed to the right. In only one of these drawings is the magnetic force F_(vector) physically reasonable. Which drawing is it?

(a) 1

(b) 2

(c) 3

(d) 4