I think para completion is not part of GMAT CR questions.

no premise markers , no conclusion markers , no contrast
This probably requires an extension of the same .

My few thoughts.

Firstly, for GMAT, there should be 5 choices and this one has just 4.
Secondly, related to para completion:

The paragraph is like a narration, like a father telling something to his son. The father is remembering his old times, and telling the political scene. Ronald Regan was..... Marines were.... McNugget was..... . Now, after the first line, he comes to the present situation that mid term elections are coming... then he again goes back to 1983 when 77% of population was white...

These are basically some evidences the argument is providing you. Now in 2010, the white people vote percentage in the mid-term elections is 77%, inspite of the fact that white people now DONT make up 77% of the population [a proportion that has since declined rapidly as a result of births to non-whites and immigration].

Now looking at answer choice:

a) Demography does not translate neatly into politics. ---> Irrelevant. Out of Scope. Nothing is mentioned in passage about this.

b) When the presidency is up for grabs, many more Americans bother to vote. ---> Out of scope. Nothing is told about how many total americans vote or how many bother to vote as a whole.

c) Taken together, race and age help to explain why the Democrats face such a struggle in mid-term elections. ---> Incorrect. Nothing is told about struggle faced by democrats.

d) Racially, mid-term voters lag the changes in the voting-age population by about 20 years and the country as a whole by nearly 30. ----> Correct. Since, mid term elections have 77% vote share of whites, they LACK the changes that voting population has undergone. In 1983, whites made 77% of voting population, however, now also they make 77% vote share.


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