| Which statement about entry into a space that has been sealed for a long time is TRUE? |
| A) The heat of the sun on upper ballast tanks, such as in a bulk carrier, may generate carbon monoxide. |
| B) The natural ventilation through the installed vents is sufficient to provide the proper oxygen content. |
| C) A tank that has been used to carry hazardous liquids should be tested for oxygen content, toxicity, and explosive gases. |
| D) You can safely enter the space without a breathing apparatus if the oxygen content exceeds 14%. |
