Final answer:
In dental radiography using the paralleling technique and a #2 film sensor for anterior views, the film sensor must be positioned parallel to the long axis of the tooth to minimize distortion and produce an accurate image.
Step-by-step explanation:
When using a #2 film sensor for anterior views with the paralleling technique, the correct answer is a) Obtained with the film sensor parallel to the long axis of the tooth. This technique ensures that the x-ray beam is perpendicular to both the tooth and the film sensor, minimizing distortion and producing a more accurate representation of the tooth structure. It's important for the film to be placed in this manner to achieve the intended diagnostic results. This question is related to the field of dental radiography, which is a component of dental health practices.