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Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use?

nitrogen-fixing bacteria
denitrifying bacteria
decomposers
producers

Would the correct answer be A?

I would think it's D, but I'm not sure.

It’s D

Yes, the correct answer is A - nitrogen-fixing bacteria. These bacteria have the unique ability to convert gaseous nitrogen from the air into a form that can be used by other living organisms. Nitrogen is a crucial element for the synthesis of amino acids, proteins, and nucleic acids, which are essential for the growth and development of living organisms. While plants and animals cannot directly use gaseous nitrogen, nitrogen-fixing bacteria can convert it into ammonia or nitrates, which can then be taken up by plants and used by other organisms in the food chain.