Answer:
B. Washington, DC is not a part of a state; the original Constitution says that only the residents of states were eligible to vote for president.
Step-by-step explanation:
The reason Washington, DC. residents were excluded from all of the previous amendments that gave voting rights was because " Washington, DC is not a part of a state; the original Constitution says that only the residents of states were eligible to vote for president."
Before the passage of the 23rd amendment in the United States in 1961, the United States Constitution only allows each state with a presidential elector that is equivalent in numbers to the total number of representatives it has in the House of Representatives and Senate. And given the fact that Washington DC is only but a District, the residents were not allowed to vote, until the passage of the 23rd Amendment