A Proton with an Initial Velocity of (1

A proton with an initial velocity of (1.0x + 2.0y + 3.0z) * 10⁵ m/s enters a magnetic field of 0.50z T.Find the magnitude of the acceleration of the proton.The mass of the proton is 1.67 * 10^-27 kg.Where x,y and z are unit vectors in the x,y and z directions,respectively.

A) 4.0 * 10¹³ m/s²
B) 2.1 * 10¹³ m/s²
C) 1.5 * 10¹³ m/s²
D) 1.1 * 10¹³ m/s²
E) 2.6 * 10¹³ m/s²