Final answer:
The Suàn shù shū is a manual on mathematics from ancient China, containing practical mathematical problems for daily activities such as land measurement and grain calculations.
Step-by-step explanation:
The Suàn shù shū is c) A manual on mathematics. This ancient Chinese text dates back to the early Han dynasty and consists of a collection of mathematical problems dealing with matters such as land measurement, calculations involving grains, and the solution of proportions, among others. Unlike the The Book of Songs, which is a collection of poems and one of the "Five Classics" traditionally attributed to Confucius, the Suàn shù shū focuses on practical applications of mathematics in the daily life of its era. The subjects span across various aspects of the agrarian economy, which was the backbone of ancient Chinese society. Thus, it serves as an important historical document shedding light on the mathematics and economic practices of ancient China.