Which of the following properties of a proton can change while it moves freely in a mangetic field? (There may be more than one correct answer).

Which of the following properties of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer). (a) mass (b) speed (c) velocity (d) momentum

Which of the follwing property of a proton can change while it moves freely in a magetic field ? (There may be more than one correct answer).