Step 1: Understanding the Concept:
Animal Unit (AU) is a standard measure for livestock.
It compares the feed requirements of different animals.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the AU values of different animals.
Step 3: Detailed Explanation:
One Animal Unit (1 AU) is equivalent to one adult cow.
A buffalo is larger and has higher feed requirements.
A buffalo is considered to have 1.5 AU.
Thus, the correct value is 1.50 AU.
Step 4: Final Answer:
A buffalo is considered to have 1.50 AU.
Hence, the correct option is (D).