When dissimilar metals come in contact with a conductor, which of the following types of metal deterioration takes place?

Correct Answer: Option C — Electrochemical corrosion.

Electrochemical corrosion occurs when two dissimilar metals are in electrical contact within an electrolyte. This galvanic action causes the more anodic metal to corrode preferentially. In marine gas turbine environments, moisture and salt deposits act as the electrolyte, accelerating this deterioration process on engine components and structural interfaces.