Select the transitional device that best matches the sentence.
____ composting the trimmings, they were able to generate enough fertilizer for the organic produce businesses in the community.
Correct answer: By.
Explanation: “By” is used to denote a means of achieving something, while “due to” expresses a cause.
Correct example of the use of “due to”:
Due to the nature of the contract, its overriding principle is protection of the consumer in transactions.