Operation costing works well whenever
  a.  heterogeneous products pass through a series of processes and receive similar doses of materials, labor, and overhead.
  b.  homogeneous products pass through a series of processes and receive similar doses of materials, labor, and overhead.
  c.  homogeneous products pass through a series of processes and receive similar doses of conversion inputs and different doses of material inputs.
  d.  material cost is accumulated by process and conversion cost is accumulated by process.
  e.  none of the above.