Discussion
The main principle of low tunnels is:
Answer: B
The key gives maintaining the carbon dioxide concentration. Low tunnels are small plastic covers over a crop row, and one source I found says they trap CO2 within the covered space and so help photosynthesis. Another measurement-based source found that CO2 in a closed tunnel falls during the day, so this is not a firmly established effect; I could not find a source that settles it.
Protecting from insects, holding humidity and the oxygen concentration are not the main principle given by the key, and oxygen is not a limiting factor for plants in the way carbon dioxide can be.
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