Discussion
Litz wires are used for intermediate frequencies, to overcome:
Answer: B
Litz wires are used to overcome Skin effect.
Litz wire is made of many thin strands, each insulated from the others and woven so that every strand takes each position in the cross-section in turn. Each strand is thinner than the skin depth, and the transposition forces the current to share equally among them, so the whole cross-section is used at frequencies where a solid wire would carry current only near its surface.
Corona is a high-voltage surface discharge and radio interference is a consequence of it; stranding the conductor does nothing for either, so 'All of the above' is also wrong.
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