The order and degree of the differential equation \(\rm k \dfrac{dy}{dx}=\displaystyle\int \left[1+\left(\dfrac{dy}{dx}\right)^2\right]^{\frac{2}{3}}dx\) are respectively

• A. 1 and 1
• B. 2 and 3
• C. 2 and 4
• D. 1 and 4