A House Plant Seems to Be Growing Slowly and Lacks

A house plant seems to be growing slowly and lacks its normal bright green color.You call a botanist for advice.She suggests that the plant may be deficient in magnesium (Mg²⁺) .Why are these symptoms associated with Mg²⁺ deficiency?

A) Mg²⁺ is important in the structure of many amino acids.
B) Lack of Mg²⁺ in the soil allows pathogenic bacteria to grow.
C) Mg²⁺ is required before NADPH can function.
D) Mg²⁺ is an important component in chlorophyll.
E) Cytochromes require Mg²⁺ to function properly.