The art of mudslinging during political campaigns prevents the general public from learning about what important thing

Where the candidates stand on the issues.

Explanation:

Mudslinging refers to the process of deliberately spreading negative information about a candidate in order to affect his public image. This is usually motivated by a rival's desire to gain a dishonest advantage. One of the negative consequences of mudslinging is that it makes it very difficult for the general public to know what is true and what is false, and therefore, makes it difficult to understand where the candidates actually stand on the issues.

d) post-world war i

most camps were located in the area of the general government in occupied poland