Instructions: In this task, you will be presented with a question that has multiple possible answers. You should choose the most suitable option out of "A", "B", "C", "D", and "E", based on your commonsense knowledge.
Input: Question: The electrode wouldn't spark, it turned out that the what hadn't been connected? 
 Options: A tube B electronic equipment C electrolytic cell D charge E battery 
Output:
E