$56.$ Compared to B$2$C$,$ what are the characteristics of a number of buyers, buying influences and key promotion method for B$2$B$?$

A$)$ fewer, single$/$multiple$,$ advertising

B$)$ many, single, personal selling

C$)$ fewer, single, personal selling

D$)$ fewer, multiple, personal selling

E$)$ many, single$/$multiple$,$ advertising