Answer :
Option A is correct as horizontal angulation is the side- to -side angulation.
When the dental X-ray tube head is positioned and the center ray is pointed in a horizontal, or side-to-side, plane, this is referred to as horizontal angulation.
It remains the same when using the paralleling and bisecting techniques.
The central ray should not be directed parallel to the curvature of the arch.
Instead, it is pointed perpendicular to the curve of the tooth arch and film to prevent errors in x-ray interpretation.
A radiograph with "open" contacts is the result of proper horizontal angulation.
A radiograph with "overlapped" contacts results from incorrect horizontal angulation.
Hence, option A is correct
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