Final answer:
The correct answer is option b. 20 sections, 5 districts.
Step-by-step explanation:
In 1939, Illinois was divided into 20 sections and 5 districts.
The basic unit of division in the grid system is the township, which is a square parcel of land measuring six miles wide. Each township was further divided into smaller sections. Square mile sections (640 acres) were subdivided into quarter sections (160 acres) and quarter-quarter sections of forty acres. In total, there were 20 sections and 5 districts in Illinois in 1939.