What is the name of the preaching mudra of gesture, in which the Buddha is depicted delivering his first sermon, In the Gandhara Sculptures?

The correct answer is Dharmachakra Mudra.

The Dharmachakra Mudra is a gesture of teaching or preaching. It is one of the most common mudras in Buddhism, and is often depicted in Buddhist art. The gesture is made by placing the right hand on the left thigh, with the palm facing upwards. The index finger and middle finger are extended, while the other fingers are held together.

The Dharmachakra Mudra is said to represent the Buddha’s first sermon, in which he taught the Four Noble Truths. The gesture is also a symbol of the Buddha’s teachings, and is often used in Buddhist ceremonies and rituals.

The other options are:

• Abhaya Mudra: This gesture is made by raising the right hand with the palm facing outwards. It is a gesture of reassurance and protection.
• Dhyana Mudra: This gesture is made by placing the hands together in front of the chest, with the palms facing each other. It is a gesture of meditation and concentration.
• Bhumisparsha Mudra: This gesture is made by touching the earth with the right hand. It is a gesture of enlightenment and awakening.