As of 2015 which group of u. s. citizens remained less than fully represented in congress
a. women
b. african americans
c. people who dont own there property
d. residents of the district of columbia

The answer is D (residents of the district of columbia). Despite the civic contributions made by Columbia, they are not allowed a vote in Congress. That is why, as of 2015, there are still talks about making Columbia a state. It is because most of the Congress hesitate to do so,