Political scientists believe that the important cause for decreasing voter turnout is ____

Political scientists believe that the important cause for decreasing voter turnout is ______.

A．the inconvenience of voting

B．the commercialization of the voting procedures

C．the lack of interest and enthusiasm in politics

D．the insecurity of voting on line due to the constant breakdown of computer systems

请帮忙给出正确答案和分析，谢谢！