Step 1: Sort the options by plant type
Lucerne and berseem are legume herbs. Maize is a cereal grass. Subabul is a tree.
Step 2: Use the question word
The question asks for a tree fodder, so only a tree can be right. That leaves subabul.
Step 3: Confirm in the passage
The passage names subabul and banyan as examples of tree fodder, so option (3) is confirmed.
Step 4: State why the others fail
Options (1), (2) and (4) are field crops that are cut green, and the passage lists them under green fodder. This is a standard fact in livestock and fodder topics, so it is worth remembering for the exam. Reading the passage first and then checking each option against it avoids careless mistakes.
Final Answer:
Only subabul is a tree, so the answer is option (3).
\[ \boxed{\text{Option (3)}} \]
