Answer:
The correct answer is a) Mandalas of the Womb World.
Step-by-step explanation:
Esoteric Buddhism is characterized because its knowledge and teaching cannot be transmitted to all people; a teacher must instruct the person interested in learning the teachings of esoteric Buddhism.
In the art of esoteric Buddhism, we can see the Mandalas of the Womb World. These mandalas are the representation of the Buddhist cosmo.
In these mandalas, several elements can be identified, among them the Buddha of infinite Light, who was of importance for the growth of esoteric Buddhism. The Mandalas of the Womb World is believed to have been used by Master Kukai; he used them in his ceremonies.
I hope this information can help you.