Disinfection containers must __________ to ensure disinfectant solution does not become contaminated.

Disinfection containers must have a lid to ensure that the disinfectant solution does not become contaminated. A covered container protects the solution from exposure to airborne contaminants, debris, and other environmental factors that could introduce pathogens. An open container would leave the disinfectant vulnerable to contamination, potentially compromising its effectiveness.

Regarding the other choices, while material and disposability of containers can be important aspects of sanitation practices, the key factor in preventing contamination of the disinfectant solution itself is having a secure lid. This is why a lid is the crucial attribute for maintaining the integrity of the disinfectant within.