This figure has rock units and geologic features that are assigned letters that are not in any particular order.From the geologic relations, what is the youngest unit or feature of those listed below? 
Definitions:
Plasma Cells
Specialized white blood cells that produce antibodies in response to infections.
Cytotoxic T cells
A type of immune cell capable of killing cancer cells, infected cells, and other cells that are deemed a threat to the organism.
Antibodies
Proteins produced by the immune system that recognize and bind to specific antigens to help protect the body from infection.
Antibody Blood Levels
The concentration of antibodies in the bloodstream, indicative of the body's immune response either to infections or to vaccines.
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