Hint:We must remember that the Aravalli Range is a peak extension in north-western India, moving roughly 692 kilometres in south-west location, commencing near Delhi, passing through southern Haryana and Rajasthan and ending in Gujarat. Aravalli is a composite Sanskrit word composed of "ara" and "vali", which precisely implies the "line of peaks". Guru Shikhar illustrates the peak of the guru' and was named after Guru Dattatreya who is understood to have inhabited the mountain during his days as a monk. The tunnel atop the mountain has been renovated to a temple in his reminiscence.
We have to remember that the Guru Shikhar is the loftiest mountain of the Aravalli Range and lies approximately 15 kilometres from Mount Abu. The elevation of the mountain is 1722 meters from ocean level thereby guaranteeing an astonishing view of the Aravalli range and the cliff site of Mount Abu. Guru Shikhar is also in possession of the Mount Abu Observatory.
Guru Shikhar mountain is the dwelling to the temple of Dattatreya, an incarnation of Lord Vishnu and the mountain is named Guru Shikhar after him as Guru Dattatreya had dignified this area and his impressions are blessed there is a stone in a tunnel. Footprints of swami Ramanath are also there who enshrined the sculpture in Raghunathji shrine in Abu. Near the shrine is a temple of Guru Dattatreya's mother.
Hence, the correct answer is option (C).
Note: At the tip of Guru Shikhar is an ancient bell with the words 1411AD engraved on it. According to regional mythology, deity Anusuya was precisely determined to have a son like Tridev. She was granted a son, named Dattatreya, an epitome of the three Gods. The child had one core but three heads and six arms.