In the early 18th century, two ministers who seized power in Mysore were Nanjaraj and Devraj. These ministers played a significant role in the political landscape of Mysore during that time.

1. Nanjaraj:
Nanjaraj was a prominent minister in the Mysore Kingdom during the reign of King Chikka Devaraja Wodeyar. He held a position of power and influence in the court and was known for his administrative capabilities. Nanjaraj was instrumental in the governance of Mysore and played a key role in the decision-making process.

2. Devraj:
Devraj was another influential minister in the Mysore Kingdom during the early 18th century. He held a position of authority and was trusted by the monarch. Devraj was known for his strategic thinking and diplomatic skills. He played a crucial role in shaping the policies of the kingdom and was involved in both internal and external affairs.

The Seizure of Power:
The exact circumstances and details of how Nanjaraj and Devraj seized power in Mysore are not mentioned in the question. However, it is likely that they achieved their positions of authority through their close association with the king and their proven abilities in governance.

Nanjaraj and Devraj's Influence:
Once in power, Nanjaraj and Devraj exerted significant influence over the administration of Mysore. They played a pivotal role in decision-making, policy formulation, and implementation. Their expertise and experience helped in maintaining stability and prosperity within the kingdom.

It is important to note that the question does not provide any information about Krishna Raj. Therefore, option 'B' is incorrect. Similarly, option 'C' is also incorrect as it does not mention Devraj. Hence, the correct answer is option 'A' - Nanjaraj and Devraj.