Answer:
Option 4
9x²y²
Step-by-step explanation:
25xy √(81 ÷ 625) × x²y²
25xy × (9 ÷ 25) × xy
25 × xy × 9 × xy ÷ 25
9 × xy × xy
9 × x²y²
Thus, The answer is 9x²y²
-TheUnknownScientist