A) There has been a change in how men think of land, a change from thinking it simply private property to that now of
"That" refers to nothing clear. eliminate
B) There have been changes in how men think of land, a change from that of simple private property to now that of
"That" refers to nothing clear. eliminate
C) There has been a change in how men think of land, a change from once considering it simply private property to now considering it
Scenario 1: There has been a change in
A, a change from once considering it (=
A) simply
B Scenario 2: There has been a change in
how men think of A, a change from once considering it (=
A) simply
B since we CAN imagine two scenarios for pronoun "it", the option is eliminated.
D) Once men used to think of land as simply private property, but they consider it now
should be "simple private property". or "a simply private property" or " simply as private property". this error also appears in other options.
I do not know the exact grammatical explanation for this.
E) Once thought of simply as private property, land is now considered
although slightly changes the meaning, it has no red flags