The primary purpose of Test A is to give an indication of typical game play performance of the PC running Lost Planet 2. (i.e. if you can run Mode A smoothly, the game will be playable at a similar condition). In this test, the character’s motion is randomized to give a slightly different outcome each time.
The primary purpose of Test B is to push the PC to its limits and to evaluate the maximum performance of the PC. It utilizes many functions of Direct X11 resulting in a very performance-orientated, very demanding benchmark mode.