Step 1: Understanding the Question:
This question tests knowledge of trap crops for nematode management. Step 2: Detailed Explanation:
Cabbage is used as a trap crop for nematode management.
It attracts nematodes, reducing their population in the main crop.
Cucumber (A): Not commonly used as a trap crop.
Tomato (C): Not commonly used as a trap crop.
Carrot (D): Not commonly used as a trap crop.
Thus, cabbage is the correct answer. Step 3: Final Answer:
Thus, cabbage is used as a trap crop for nematode management, which corresponds to option (B). [0.5cm]