If bacteria were completely removed from soil plants would not be able to produce sufficient proteins and is denoted as option C.
This is referred to a type of micro organism which are present in the soil and help in the fixation of nitrogen so a to enable plants absorb them.
They are referred to as nitrogen fixing bacteria and an example is Rhizobium. Nitrogen is  a key component of protein which is why its absence will lead to plants not produce sufficient proteins.
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