In terms of percentage, which of the following metals has highest composition in Polymetalic nodules?

In terms of percentage, which of the following metals has highest composition in Polymetalic nodules?
[A]Manganese
[B]Iron
[C]Nickel
[D]Copper

Manganese
Polymetalic nodules, also called manganese modules, are rock concentrations on the sea bottom formed of concrete layers of iron and manganese hydroxides around a core. Polymetalic nodules are made up of several metals and non metals. Nodules mainly contain manganese (29.40%), iron (6%), aluminium (2.9%), nickel (1.34%), copper (1.25%), cobalt and titanium as the major components.

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