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