3.5mm mono plug to 2.5mm mono jack FEV-B193

B. 3.5mm mono plug to 2.5mm stereo jack;
C. 3.5mm mono plug to 3.5mm stereo jack
A. 3.5mm mono plug to 2.5mm mono jack;
B. 3.5mm mono plug to 2.5mm stereo jack;
C. 3.5mm mono plug to 3.5mm stereo jack
3.5mm mono plug to 2.5mm mono jack FEV-B193
A. 3.5mm mono plug to 2.5mm mono jack;
B. 3.5mm mono plug to 2.5mm stereo jack;
C. 3.5mm mono plug to 3.5mm stereo jack