$B2B$ markets differ from B$2$C markets because:

A many more products are sold in B$2$C markets than B$2$B$.$

$($B$)$ B$2$C transactions occur prior to B$2$B transactions.

there are fewer B$2$B transactions resulting in smaller dollar sales

salespeople personally call on business customers to a far greater extent than they do consumers.

$($E$)$ business products are often much less complex than consumer products.