Question

use of fertilizer
crop rotation
use of seedlings
improved irrigation
new types of plows

The above list describes agricultural improvements under the
A.
Yuan Dynasty.
B.
Ming Dynasty.
C.
Sung Dynasty.
D.
Sui Dynasty.

Answer 1

C. Sung Dynasty.

These changes describe agricultural innovations during the Song (Sung) period — e.g., improved irrigation and plows, use of fertilizer and seedling transplantation (including Champa rice), which boosted productivity and population.