Which of the Following Materials Handling Events Occurred First (I

Which of the following materials handling events occurred first (i.e., earliest) in the historical development of materials handling management?

A) Collapsible cardboard boxes are introduced.
B) Materials handling courses and laboratories begun at major U.S. universities.
C) Occupational Safety and Health Act (OSHA) is passed.
D) Patent issued for barcoding.
E) Use of pallets begins.