The soil will have the greatest drainage if it has:Very smooth textureA low temperatureSmall particlesBig particles

The soil will have the greatest drainage if it has big particles. Here's why:

1. Soil Texture: The texture of the soil is determined by the size of the particles that make up the soil. The three main types of soil particles are sand (the largest), silt (medium), and clay (the smallest).

2. Drainage: Drainage refers to the soil's ability to allow water to pass through it. The larger the soil particles, the more space there is between them for water to flow through.

3. Big Particles: Therefore, soil with larger particles, such as sandy soil, will have the greatest drainage. The large particles create large pores, or spaces, which allow water to drain quickly.

4. Other Factors: While temperature can affect the rate at which water evaporates from the soil, it doesn't directly affect the soil's drainage. Similarly, the smoothness of the soil doesn't significantly impact its drainage.

So, the size of the soil particles is the most important factor in determining the soil's drainage, with larger particles leading to better drainage.