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To become a South Korean citizen, one must undergo one of three types of naturalization: general, simple or special.

Most people wanting to acquire South Korean citizenship go through the general process, which requires a minimum five years of consecutive stay and a permanent address here. The simple and special processes require less time, but require applicants to meet specific criteria.

Those with a parent that had been a South Korean citizen can apply for the simple process after three years of consecutive stay, and those married to a South Korean can do so after just two.

The special process does not have a requirement for consecutive stay, although one needs to meet other criteria, such as having a parent who is currently a South Korean citizen.

Answer: c