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Jawaban B
*semoga membantu*

9x² - 25/6x² + 19x + 15
= (3x - 5)(3x + 5)/6x² + 10x + 9x + 15
= (3x - 5)(3x + 5)/2x(3x + 5) + 3(3x + 5)
= (3x - 5)(3x + 5)/(3x + 5)(2x + 3)
= 3x - 5/2x + 3 (B).