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Solutions
The given sentence is in active voice and it belongs to simple past tense. Below are the structure of active/passive voice for such sentences:
Active: Subject + verb (IInd form) + object..
Passive voice: Object + was/were + verb (IIIrd form) + by + subject..
So, based on the above structures, we can convert the given sentences into passive voice:
The garbage was first sun-dried for one to three days to bring down the moisture level.
Hence, option D is the correct answer.