Which of the following is a simple sentence?
The lobbyist proposed strict labeling requirements.
The lobbyist proposed strict labeling requirements, but they were not adopted.
We never know whether food contains GMOs because it doesn't have to be labeled
Since there are no labeling requirements, we do not know if a food contains GMOs.

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Answer:

The first sentence

Explanation:

The rest of the sentences have conjunctions like 'but' and 'because'. They're connecting two sentences together with a comma. The first one is one simple sentence with no commas or conjunctions. A conjunction is a word that connects two sentences to make a compound sentence.