Midterm elections usually have the characteristic of lower voter turnout than Presidential year elections.
People usually feel less motivated and, as a result, less people vote during what is considered "off years." As a result, there is often more movement in who holds the House or Senate as a result of only die hard voters participating in the off year.
So the answer to this question is B
The correct answer here is the last option.
Legislative moves at an ever higher pace and the number of bills that is introduced during the legislative sessions has increased. The state legislatures introduce though more bills than the federal legislature and the percent of the bills they propose is on the rise.