Exp) Option b is the correct answer.

Option b is correct: Ashokan inscriptions suggest that ‘Pradeshika’, ‘Rajuka’ and ‘Yukta’ were important officers at the district-level administration. At the district level, the officials listed were Pradeshika, Rajuka and Yukta. Pradeshika was the overall in-charge of the district, with no advisory council. The district administration was under the charge of Rajukas, whose position and functions are similar to modern collectors. Rajukas were vested with the authority not only to reward people but also to punish them when necessary. The Yukta was a junior officer giving secretarial kind of assistance to the other two in accounting, secretarial, and other miscellaneous works.

• The officials fulfilled the following duties: survey and assessment of land; tours and inspections; revenue collection; and maintaining law and order.
• Third Edict mentions ‘Pradeshikas’, Rajukas’, and ‘Yuktas’ and their need for going on tours of inspection every five years as part of their other duties, preaching dhamma, and also adopting liberal attitude towards Brahmanas and Shramanas.

Source:

History – Tamil Nadu SCERT – XI (Old), Chapter – 6, The Mauryan Empire, Pg. 68 – 69

Ancient History, NCERT – XI, Chapter – 14, The Age of Mauryas, Pg. 100 – 101

Ancient and Medieval History, Poonam Dalal Dahiya, Chapter – 6, The Mauryan Empire (c. 324 – 187 BCE)

Source: https://egyankosh.ac.in/bitstream/123456789/64794/1/Unit16.pdf