How the coronation of crown prince was described under the Vijayanagar rule? 

Correct option is D

Explanation
Under the Vijayanagar rule, the ceremony for the coronation of the crown prince was specifically known as Yuvaraja Pattabhisegam.

Explanation of Other Options
A. Aswamedayagam: This is an ancient Vedic ritual, typically a horse sacrifice, performed by a king to assert his imperial sovereignty and power. It is not a coronation ceremony.

B. Pattabhisegam: While this is the general term for a coronation, Yuvaraja Pattabhisegam is the more precise and specific term used for the anointment of the Crown Prince.

C. Satabhisegam: This is a special ceremony celebrating the completion of 80 years (or sometimes 100 years) of a person's life. It is not a ceremony for ascending the throne.