The Position of an Electron in a Be²⁺ Ion Is

The position of an electron in a Be²⁺ ion is known to 5.0´10^-11 m. What is the uncertainty in its velocity?

A) 2.0´10⁵ m s^-1
B) 1.2´10⁶ m s^-1
C) 4.6´10⁶ m s^-1
D) 9.2´10⁶ m s^-1
E) 3.0´10⁸ m s^-1