The Solution Of $( x + 2 y ) d x + y d y = 0$

Multiple Choice

The solution of $( x + 2 y ) d x + y d y = 0$ is

A) $\ln x + \ln ( y + x ) = c$
B) $\ln ( ( y + x ) / x ) = c$
C) $\ln ( y + x ) + x / ( y + x ) = c$
D) $\ln ( y + x ) + x / ( y + x ) + c$
E) it cannot be solved