(please help asap T-T) Using long division, find the quotient of (6x^3 + x^2 - 2x + 15) / (2x + 3)
a. 3x^2 - 4x + 5


b. 3x^2 + 5x - 6


c. 2x^2 + 3x - 5


d. 3x^2 - 5x - 5