Step 1: Understanding the Concept:
Sowing and planting methods are categorized by the spatial distribution and arrangement of seeds in the field.
Step 2: Detailed Explanation:
The primary sowing methods are:
1. Drill seeding: Dropping seeds continuously in a continuous narrow furrow line.
2. Hill dropping: Dropping groups of multiple seeds at predetermined, equal intervals along rows.
3. Precision planting: Placing individual single seeds at exact, uniform plant-to-plant spacings.
4. Broadcasting: Random, scattered distribution of seeds across the soil surface.
Step 3: Final Answer:
Hence, placing a group of seeds at equal intervals in rows is Hill dropping, corresponding to option (B).