2.5mm stereo plug to 3.5mm stereo jack FEV-B192

B. 2.5mm stereo plug to 3.5mm mono jack;
C. 2.5mm stereo plug to 3.5mm stereo jack
A. 2.5mm stereo plug to 2.5mm mono jack;
B. 2.5mm stereo plug to 3.5mm mono jack;
C. 2.5mm stereo plug to 3.5mm stereo jack