The deficiencies of micronutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport -

1. A. Ca, K, Na
2. B. Co, Ni, Mo
3. C. Mn, Co, Ca
4. D. Cu, Mn, Fe

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