During the eighteenth century, widespread changes in agriculture, known as the
agrarian revolution, involving the large-scale introduction of enclosed fields, of new
farming techniques and crops, and the substitution of commercial for subsistence
farming.
A. revolution, involving the large-scale introduction of enclosed fields, of new farming
techniques and crops, and
B. revolution, involved the large-scale introduction of enclosed fields and of new
farming techniques and crops, and
C. revolution, which involved the large-scale introduction of enclosed fields and of new
farming techniques and crops, and
D. revolution involved the large-scale introduction of enclosed fields, new farming
techniques and crops, and of
E. revolution that involved the large-scale introduction of enclosed fields and new
farming techniques and crops, and of

OA B, Why not [spoiler]C[/spoiler]....in B