Sentence Correction

1)Although the invention of the printing press led to a significant reconceptualization of textual production in the fifteenth century, what has been equally significant in the twentieth century is the invention of the computer.
a)what has been equally significant in the twentieth century
b)equally significant in the twentieth century has been
c)no less significant in the twentieth century is
d)what was equally significant in the twentieth century were
e)no less significant in the twentieth century was

2)Scientists are currently trying to determine the extent to which tectonic plates have been shifted from their previous positions by earthquakes and other similar phenomena.
a)to which tectonic plates have been shifted
b)to which tectonic plates have shifted
c)of the shift of tectonic plates
d)of tectonic plates shifting
e)that tectonic plates have been shifted


3)It was anomalies in the orbit of Uranus that led to the discovery of Neptune.
a)It was anomalies in the orbit of Uranus
b)It was the orbit of Uranus showing anomalies that
c)They were anomalies in the orbit of Uranus that
d)The orbit of Uranus being anomalous was what
e)The anomalies in the orbit of Uranus was what