The degree of the differential equation $\bigg(\large\frac{d^2y}{dx^2}\bigg)^3+\bigg(\frac{dy}{dx}\bigg)^2$$+\sin\bigg(\large\frac{dy}{dx}\bigg)$$+1=0\; is$

Question

$$(A)\;3\qquad (B)\;2\qquad(C)\;1\qquad(D)\;not \; defined$$