What type of headstone is slightly slanting and set above ground?

The answer is bevel top marker, which is characterized by its slightly slanting surface and its positioning above ground level. This design helps to enhance visibility and can act as a practical feature by allowing rain or debris to run off more easily due to the slant. This type of marker is often used in cemeteries for its aesthetic appeal, as well as its functionality.

In contrast, other options do not fit this description. A bed marker is generally flat and flush with the ground, making it less visible and not slanting. A bench is a seating structure rather than a grave marker, and basemolding typically refers to the framing or base of a monument or stone rather than a headstone itself. Thus, the bevel top marker stands out as the correct choice due to its distinctive slant and elevated position.