What systems are used to collect and separate dust, stock, and refuse?

The reason that "Dust, Stock, and Refuse Collectors" is the correct choice lies in the specificity of the terminology. This option directly refers to systems designed to not only collect particulate matter (such as dust) but also handle larger items such as stock and refuse. These collectors are crucial in industrial settings to maintain cleanliness and safety by removing unwanted materials generated during manufacturing processes.

Dust collectors utilize filtration mechanisms to capture dust particles, while refuse collectors manage larger waste items. The comprehensive function of these systems is essential for maintaining operational efficiency and compliance with health and safety regulations.

The other options, while related, do not encompass the same level of specificity required for effectively identifying systems that address all three components—dust, stock, and refuse. Filtering systems pertain primarily to the removal of particulate matter, while waste management systems generally handle broader waste disposal and recycling processes, and separation units usually focus on sorting materials rather than their collection. As such, "Dust, Stock, and Refuse Collectors" stands out as the most precise description of the systems utilized for these purposes.