$$\text { Find } \mathrm { dr } / \mathrm { d } \theta$$

Multiple Choice

$$\text { Find } \mathrm { dr } / \mathrm { d } \theta$$
- $$\mathrm { r } \sqrt { \theta + 1 } = 4$$

A) $\frac { 2 r } { \theta + 1 }$
B) $- \frac { r } { 2 ( \theta + 1 ) }$
C) $\frac { r } { 2 ( \theta + 1 ) }$
D) $- \frac { 2 r } { \theta + 1 }$