Step 1: General maturity ages.
- Buffaloes (C): Attain puberty later, usually 36–42 months.
- Crossbreed cattle (D): Mature around 24–30 months.
- Purebred exotic cattle (A): Mature around 18–24 months.
- Zebu cattle (B): Indigenous cattle, mature early around 15–18 months.
Step 2: Decreasing order (highest → lowest).
Buffaloes (C) > Crossbreed cattle (D) > Purebred exotic cattle (A) > Zebu cattle (B)
Step 3: Match with options.
This corresponds to Option 1.
Final Answer: \[ \boxed{\text{The decreasing order is (C), (D), (A), (B).}} \]