At the Fermilab Accelerator in Weston,Illinois,singly-Charged Ions with Momentum 4

At the Fermilab accelerator in Weston,Illinois,singly-charged ions with momentum 4.8 × 10−¹⁶ kg⋅m/s are held in a circular orbit of radius 0.8 km by an upward magnetic field.What B-field must be used to maintain the ions in this orbit? (qion = 1.6 × 10−¹⁹ C)

A) 9.6 T
B) 2.4 T
C) 3.8 T
D) 0.16 T
E) ​0.27 T