B

Step 1: The magnetic force \( F \) acting on a charge \( q \) moving with velocity \( v \) in a magnetic field \( B \) is given by the equation:
\( F = q (\mathbf{v} \times \mathbf{B}) \).

Step 2: From this equation, we can see that the force depends on the charge \( q \), the velocity \( \mathbf{v} \), and the magnetic field \( \mathbf{B} \), but not on the mass of the charge.

Thus, the magnetic force does not depend on B: mass.
Therefore, the correct answer is B.