What is the acceleration of a proton moving with a speed of 9.5 m/s at right angles to a magnetic field of 1.4 t ?

The magnetic force  provides the centripetal force that keeps the proton in circular motion:

where the second term is the centripetal force, which is the product between the mass of the proton m and the centripetal acceleration: 
If we divide by m both terms, we can calculate the centripetal acceleration of the proton:

Answer the above statement is ( false );

The best answer i can think of is b