2.5mm mono plug to 2.5mm stereo jack FEV-B191

B. 2.5mm mono plug to 3.5mm mono jack;
C. 2.5mm mono plug to 3.5mm stereo jack
A. 2.5mm mono plug to 2.5mm stereo jack;
B. 2.5mm mono plug to 3.5mm mono jack;
C. 2.5mm mono plug to 3.5mm stereo jack
2.5mm mono plug to 2.5mm stereo jack FEV-B191
A. 2.5mm mono plug to 2.5mm stereo jack;
B. 2.5mm mono plug to 3.5mm mono jack;
C. 2.5mm mono plug to 3.5mm stereo jack