[A]. The flank of the tool is the surface or surfaces below and adjacent to the cutting edges
[B]. The nose is the corner, arc or chamfer joining the side cutting and the end cutting edges
[C]. The heel is that part of the tool which is shaped to produce the cutting edges and face
[D]. The base is that surface of the shank which bears against the support and takes tangent pressure of the cut
✅ The correct answer is option C.