Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because（）.
- Aa subsequent temperature rise will cause the cargo to overflow
- Bair pockets may cause the cargo to bubble out of the ullage hole
- Cthe increased viscosity of the product requires higher loading pressure which increases the chances of a spill
- Dthe tank valve may be stiff and a spill will occur before the valve can be closed