A \( 9 x \frac{d^{2} y}{d x^{2}}-3 \frac{d y}{d x}=32 x^{-\frac{1}{3}} \)
B \( 9 x \frac{d^{2} y}{d x^{2}}-3 \frac{d y}{d x}=32 x^{-\frac{7}{3}} \)
C \( 9 x \frac{d^{2} y}{d x^{2}}-3 \frac{d y}{d x}=32 x^{\frac{1}{3}} \)
D \( 9 x \frac{d^{2} y}{d x^{2}}+\frac{d y}{d x}=32 x^{\frac{-1}{3}} \)
E \( 9 x \frac{d^{2} y}{d x^{2}}+21 \frac{d y}{d x}=32 x^{\frac{-1}{3}} \)