Option 1: Agnishtoma - The Agnishtoma sacrifice is a ritual where the soma drink is offered to the fire god Agni. It is not specifically a royal consecration ceremony but is performed by different individuals or groups for various purposes.

Option 2: Rajasuya - The Rajasuya sacrifice is indeed a royal consecration ceremony. It is a complex ritual performed by a king to assert his sovereignty and status as the ruler of his kingdom. The ceremony involves the king inviting other kings and important personalities to partake in the event, and it includes various rituals and offerings to please the deities and establish the king`s dominance.

Option 3: Vajapeya - The Vajapeya sacrifice is a ritual where the soma drink is offered to the fire god Agni. It is performed to gain power and strength but is not specifically a royal consecration ceremony.

Option 4: Asvamedha - The Asvamedha sacrifice is a ritual where a horse is set free and allowed to roam freely. The territories that the horse roams are claimed by the king who performs the sacrifice. Although it may be performed by kings, it is not specifically a consecration ceremony.

From the given options, the correct answer is option