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Which of the metallic structure will require more impressed current density for cathodic protection?

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Which of the metallic structure will require more impressed current density for cathodic protection?

(a) Water heaters in hot freshwater

(b) Underground pipelines

(c) The storage tank of H2SO4

(d) Reinforcement rods

This question was addressed to me in a job interview.

The query is from Cathodic and Anodic Protection in chapter Corrosion Prevention of Corrosion Engineering

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Right answer is (c) The storage tank of H2SO4

To explain: Impressed method current is an external supply of power to provide electrons to metallic structure that needs to be protected. The storage tank of H2SO4 requires the highest current density per sq. feet due to the high corrosiveness of acid.

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