Question 1060 Deck General

The correct answer is C) one half the ullage of the tank and one meter below the tank top. This is the correct answer because, as per the regulations, when measuring the oxygen content of cargo tanks prior to loading cargoes requiring vapor recovery, the measurements should be taken at one half the ullage of the tank and one meter below the tank top. This ensures that the oxygen content is checked at the critical points in the tank where any potential hazardous vapors may accumulate. The other options are incorrect because they do not align with the regulatory requirements. Option A is too broad, Option B focuses on the wrong locations, and Option D does not include the measurement at one meter below the tank top.