Final answer:
The words 'refuse', 'rubbish', and 'garbage' all accurately match the word 'waste', with 'garbage' often specifically referring to food waste. The term 'dregs' can have a metaphorical match but is less common for solid waste identification.
Step-by-step explanation:
The word "waste" in the context of land pollution corresponds to solid wastes, which are items discarded by the public. All the provided options, namely a) refuse, b) rubbish, c) garbage, and d) dregs can match the word "waste" to varying extents. However, in the specific context of municipal solid waste (MSW), which includes everyday items discarded by the public, the most accurate synonyms would be 'refuse', 'rubbish', and 'garbage'.
These terms are often used interchangeably in different parts of the English-speaking world to represent what is known as MSW. Option d) 'dregs' typically refers to the remnants or sediment at the bottom of a liquid, or the most worthless part or parts of something, and while it can metaphorically match 'waste', it is not the best match in this context.