(B) Chlorophyll is a green pigment found in plants that is essential for photosynthesis.Its molecular structure consists of a porphyrin ring with a ce

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(B) Chlorophyll is a green pigment found in plants that is essential for photosynthesis.Its molecular structure consists of a porphyrin ring with a central metal ion.The central metal ion present in the core of the chlorophyll molecule is $Mg^{2+}$ (magnesium).Therefore,the correct option is $B$.