The correct answer is D) machines could shock people when they first touch them.
What is not a criticism of electronic touch screen voting machines is "machines could shock people when they first touch them."
That is nonsense. Modern technology has to pass many tests before being launched to public use. What indeed has been a constant critic about electronic touch screen voting machines is the following: hackers could access data, equipment makers contribute heavily to the Republican party, and the lack of paper ballots makes recounts difficult.
But like everything new, it has advantages and disadvantages. There is also some misinformation about this issue. That is why people have concerns about voting machines.