The correct option is B Fe
Plants require several minerals for optimum growth and function. According to the quantity required the minerals are grouped into two classes macronutrients and micronutrients. The iron is a micronutrient required in largest amount. It is required for chlorophyll biosynthesis and for activity of electron transport proteins in the electron transport chains. It is also required as an essential co-factor for activity of several enzymes, like aconitase.