agri

[maihuna]

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
[spoiler]Answer:guess[/spoiler]

[loveusonu]

It should be B
A,C&E doesn't have main verb involving is a participle and hence all 3 options eliminated.

Even D has 'involved' in a modifier clause"known as.." Hence even D doesn't have main verb.

B. revolution, involved the large-scale introduction of enclosed fields and of new farming techniques and crops, and

B has following things perfect:

1>Involved playing the main verb.
2>"the large scale intro..." is parallel with "and the substitution..."
3>Introduction of X & of Y
X=enclosed fields
Y=new farming techniques and crops

[punitkaur]

Agree with B

[heshamelaziry]

One more vote for B