Partisan Manipulation of Congressional and State Legislative Redistricting Has Become

Partisan manipulation of congressional and state legislative redistricting has become much easier in recent years due to:

A) higher levels of partisan polarization.
B) sophisticated mapping software and more data on local voting patterns and demographics.
C) legislative appointment of "special masters" to draw maps for redistricting.
D) the Census Bureau's division of the population into census blocs, which typically contain a few dozen people.