Select the options that best complete the statement.

Positively charged particle trajectories
(always, never, the same as)
follow electric field lines, because
(electric field lines are defined by the path positive test charges travel.,
the particle velocities may or may not be in the same direction as the electric field lines.,
positive charges repel each other and, therefore, are repelled by electric field lines.,
the electric force on a positively charged particle is in the same direction as the electric field.)

Positively charged particle trajectories always follow electric field lines because the electric force on a positively charged particle is in the same direction as the electric field.

Explanation:

For any positive charge the electric field emerges radially outwards and it goes radially inwards for the negative charges.

From the theory of electric field lines we know that they never intersect each other, either they get merged when the sources are unlike or they repel when the sources are alike. In other words the electric field lines align in the same direction as that of the field.
So, when a positive charge is released into the an electric field they follow the direction of the field lines because they too have their field lines emerging radially outwards and hence these lines align in the direction of the field.