A positively charged particle moving due east enters a region

A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will

1. continue to move due east
2. move in a circular orbit with its speed unchanged
3. move in a circular orbit with its speed increased
4. gets deflected vertically upwards.

In a perpendicular magnetic field, the path of a charged particle is a circle, and the magnetic field does not cause any change in energy.