Assertion(A): specific charge of $\alpha -$ particle is twice to that of proton.

Reason(R): Specific charge is given by e/m.

• A

  Both A and R are true and R is the correct explanation of A

• B

  Both A and R are true and R is not the correct explanation of A

• C

  A is true, But R is false

• D

  A is false, But R is true