The 'Bhumisparsha Mudra' (Earth-touching gesture) represents the moment of Siddhartha Gautama's enlightenment at Bodh Gaya. According to Buddhist tradition, the demon Mara challenged Siddhartha's right to the seat of enlightenment, claiming it for himself. In response, Siddhartha touched the ground with his right hand, calling upon the Earth goddess (Sthavira or Vasudhara) to witness his accumulated merits and purity across countless past lives. The Earth's testimony confirmed his worthiness and defeated Mara's temptations. Option A is incorrect because the Earth was summoned as a witness to his spiritual authority, not as a guard to physically prevent Mara from disturbing his meditation.