The view that the first crusade was an opportunity for spare (i.e., "surplus") sons to make themselves scarce in order to relieve their families of burdens is A) fully substantiated by the surviving...

The view that the first crusade was an opportunity for spare (i.e., "surplus") sons to make themselves scarce in order to relieve their families of burdens is

A) fully substantiated by the surviving charters.

B) not at all substantiated by the surviving charters.