Explanation:

The correct answer is option 'A', Muhammad-bin-Tughlaq.

Background:
Muhammad-bin-Tughlaq was the Sultan of Delhi from 1325 to 1351 AD. He was known for his administrative and economic reforms, as well as his eccentricities and unconventional policies.

Judicial Functionaries:
Judicial functionaries were officials responsible for the administration of justice in the Delhi Sultanate. They included qazis (judges), muftis (legal experts), and other legal officers.

Census Registers:
Census registers were records containing information about the population, land ownership, and other demographic details of an area. They were used for administrative and taxation purposes.

Muhammad-bin-Tughlaq's Order:
Muhammad-bin-Tughlaq ordered the judicial functionaries to complete census registers for the various quarters of Delhi. This order was part of his larger plan to establish a new capital city called Daulatabad, which he believed would be more strategically located and secure than Delhi.

Reasons for the Order:
Muhammad-bin-Tughlaq wanted to accurately assess the population and resources of Delhi to ensure a smooth transition of the capital. By completing census registers, he could gather data on the number of people, their professions, and landholdings in each quarter of Delhi. This information would help in planning the relocation and redistribution of resources.

Importance of Census Registers:
Census registers provided valuable information for taxation purposes. They helped in determining the tax base, identifying potential sources of revenue, and assessing the economic potential of an area. They also helped in maintaining law and order, as the records could be used to resolve disputes and enforce property rights.

Conclusion:
Muhammad-bin-Tughlaq's order to complete census registers for the various quarters of Delhi was part of his larger plan to establish a new capital city. This order reflected his administrative and economic reforms, as well as his efforts to gather accurate data for effective governance.