Crop rotation: Identify the historical figure who developed and popularized the system in Britain. Full question: Who developed the idea of crop rotation (notably the four-field system)? Choose the correct option.

Given data

• Topic: Agricultural innovation in Britain.

Concept / Approach
While rotation concepts are ancient, Charles Townshend popularized and advanced the four-field crop rotation (turnips, barley, clover, wheat) during the British Agricultural Revolution, improving soil fertility and yields.

Option analysis
Townshend: Correct — championed the system. Jethro Tull: Seed drill and agricultural mechanization. Norman Borlaug: Green Revolution in the 20th century. Robert Bakewell: Selective livestock breeding.

Final Answer
Charles Townshend (Turnip Townshend).