$A$ proton moving with a velocity of $2.5 \times 10^7 \, m/s$ enters a magnetic field of intensity $2.5 \, T$ making an angle of $30^o$ with the magnetic field. The force on the proton is:
- A$3 \times 10^{-12} \, N$
- B$5 \times 10^{-12} \, N$
- C$6 \times 10^{-12} \, N$
- D$9 \times 10^{-12} \, N$
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