The correct answer is: A. diverging to the right side and merging from left.
A direct interchange ramp is a type of interchange ramp that allows drivers to change from one freeway to another without having to cross any traffic lanes. The ramp is typically designed with a right-hand exit and a left-hand entrance. Drivers who are exiting the freeway will diverge to the right side of the road and merge onto the ramp. Drivers who are entering the freeway will merge from the left side of the road and diverge to the right side of the freeway.
The other options are incorrect because they do not describe the correct way to use a direct interchange ramp. Option B describes a left-hand exit and a right-hand entrance. This is not possible on a direct interchange ramp, as the ramp would be too narrow to accommodate two lanes of traffic. Option C describes a right-hand exit and a right-hand entrance. This is not necessary on a direct interchange ramp, as drivers can simply continue on the freeway without having to merge. Option D describes a left-hand exit and a left-hand entrance. This is not possible on a direct interchange ramp, as the ramp would be too narrow to accommodate two lanes of traffic.