Final answer:
The correct answer is option b) Terrace farming is a method of agriculture, and it helped the Inca conserve water.
Step-by-step explanation:
Terrace farming is a method of agriculture where flat areas (terraces) are cut into near vertical slopes to allow for farming. The Inca used terrace farming to grow enough food for their large population in the steep and mountainous terrain of the Andes.
By creating terraces, the Inca were able to make flat and easily worked plots for farming. Terraces also helped with drainage and soil erosion, and created micro-climates for growing different plants. The Inca relied on terrace farming to achieve a high level of agricultural production.