In esoteric buddhism,
a. mandalas were outlawed by buddhist priests.
b. the pottery was made using a coil technique.
c. there were many deities who were all part of a universal buddha.
d. buddhism was spread to china and korea.

Correct answer choice is :

C) There were many deities who were all part of a universal Buddha.

Explanation:

Shingon Buddhist is one of the main institutions of Buddhism in Japan and one of the rare surviving Vajrayana families in East Asia, basically grown from India to China by visiting priests such as Vajrabodhi and Amoghavajra. Recognized in Chinese as the Tangmi, these secret instructions would next wave in Japan under the auspices of a Buddhist priest called Kūkai, who moved to Tang China to take and demand the release of the secret education.