Which is the most stable carbocation ?

As the no. of +IE groups [alkyl groups] increases,              sharing of positive charge by number of carbon atoms increases,               i.e., charge distribution among the atoms increases,              hence stability of carbocation increases.Hint:            sharing increases,             caring increases,            stability increases.E.g:                                                         "H" is neither +IE nor –IE group                                      Here  "CH3" group acts as +IE group+ve cahrge located only on single carbon                   +ve charge is shared among the 4-carbon atoms charge on carbon atom = 96500 [1F]                      charge on each carbon atom is = 96500/4Hint: As charge [weigth] on head increases,      stability decreases.