Option B:

Compression of the cervical sympathetic chain is the probable reason for an open right eye in this case.
Dilated pupils are seen when the ligature knot presses on the cervical sympathetic chain, the eye on the same side may remain open and its pupil dilated is termed as le facie sympathique. It indicates antemortem hanging.
Dribbling of saliva is the surest sign of antemortem hanging.
This occurs due to the increased salivation before death due to the stimulation of the salivary glands by the ligature or by congestive hypoxia.
Stimulation of pterygopalatine ganglion also causes increased salivation.
Dribbling of saliva occurs from the angle of the mouth opposite to the side of the knot. When the knot is on the nape of the neck, it occurs across the middle of the lower lip.
The ligature mark is usually above the hyoid bone.
It runs obliquely, backward, upwards, is non-continuous, and towards the point of suspension.
The mark is noncontinuous because of a gap at the nape of the neck. When the knot is in an inverted V shape when it is in contact with the skin, because the ligature material extends downward on both sides.
The skin is usually depressed/grooved, yellowish-brown, dry, hard, with small abrasions called rope burns at its edges.
Protrusion of the tongue results from the pressure on the floor of the mouth by ligature. It is usually swollen and blue.
Injuries include bite marks with or without underlying small hemorrhages (‘marginal’ hemorrhages).
Tardieu’s spots may be present on the forehead, over the eyelids, under the conjunctiva, and near the temple.

Other Options:

Option A- In partial hanging, internal jugular veins are compressed, but vertebral arteries continue to supply blood to the head, resulting in congestion of the face and petechiae. When suspension is complete, face is pale and petechial haemorrhages are relatively uncommon due to the complete obstruction of the arterial system.
Option C- Vagus nerve compression leads to a sudden halt of the progression of the pure asphyxial process due to the superimposition of vagal inhibition. In these cases, the face remains pale.
Option D- Right internal carotid artery compression can cause transverse tears of carotid artery intima, known as the Amussat's sign. It is seen with antemortem hanging. These are usually seen in obese victims and in posteriorly placed knots.

Reference: The Essentials of Forensic Medicine and Toxicology, 33rd edition (Page No. 344).

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