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Which one of the following statement is correct?

[A].	Blue green algae fix 20-30 kg N/ha in a rice field	[B].	Blue green algae fix 40-50 kg N/ha in a rice field
[C].	Blue green algae fix 8-10 kg N/ha in a rice field	[D].	Blue green algae fix 60-70 kg N/ha in a rice field

Answer: Option A