For how long is the voluntary ignition interlock installation period after a 3rd or subsequent offence?

Answer: C — 365 days

The incorrect options of A, B, and D may seem like reasonable choices, but upon further consideration, they do not accurately reflect the legal requirements for a 3rd or subsequent offense. Option A of 90 days is too short, as it is only equal to one quarter of a year, while option B of 180 days is only equal to half a year. These options do not match the severity of a 3rd or subsequent offense. Option D of 730 days is too long, as it is equal to two years, which is longer than the maximum voluntary installation period. Therefore, option C of 365 days is the correct choice, as it is equal to one year, and falls within the appropriate range for a 3rd or subsequent offense.