The release of lytic granules from cytotoxic T cells is aimed specifically at infected target cells ...

The release of lytic granules from cytotoxic T cells is aimed specifically at infected target cells while preserving the integrity of neighboring, uninfected cells. This is best explained by the observation that _____.
 
  a. only target cells bearing appropriate peptide:MHC class I complexes are susceptible to necrosis
  b. redistribution of lytic granules in the T cell delivers them to confined areas on the target cell in contact with the T cell
  c. regulatory T cells deliver survival signals to uninfected neighboring cells that renders them resistant to cytotoxins
  d. the amount of cytotoxins in a given cytotoxic T cell is so limited that only the cell closest to the T cell will succumb to the effects of perforin and granzyme
  e. uninfected cells are highly resistant to the effects of cytotoxins.