Which of the following is most likely to be the first step in the general mechanism for electrophilic substitution reactions? 
Definitions:
Calcium
A mineral essential for bone health and the proper function of the heart, muscles, and nerves.
Red Blood Cells
Cells in the blood responsible for carrying oxygen from the lungs to the body's tissues and returning carbon dioxide from the tissues back to the lungs.
Iron
A metallic element essential for human health, used in the body to make hemoglobin for oxygen transport in the blood.
Unsaturated Fats
Fats, including most vegetable oils, that is usually liquid at room temperature and tends to lower blood cholesterol.
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