Final answer:
The exact percentage of intercontinental containerized trade volume moved by ocean is not provided in the reference information. Container ships are crucial for global trade, and most of it is by sea, suggesting a high percentage, but without explicit data, an exact figure cannot be confirmed.
Step-by-step explanation:
Looking at the options given for the percentage of intercontinental containerized trade volume moved by ocean, and considering the information provided, we can deduce that the correct answer is not explicitly stated. However, we know that container ships are a primary mode of transportation for global trade and play a significant role in oceanic transport of goods. The information given emphasizes the importance of container ships in overseas ballast water (BW) discharge, which is indirectly related to trade volumes. Unfortunately, the information does not provide a direct percentage that aligns with the available answers for the question.
Therefore, it's important to note that while container ships account for a large proportion of international trade, and the majority of global trade by volume is carried by sea, the exact percentage of trade volume moved by ocean for containerized cargo is not specified in the reference information provided. If pressed to approximate, one could argue that, given the dominance of ocean shipping in global trade, the percentage would likely be very high, complementing options c) 80% or d) 95%. However, without specific data to confirm this, selecting an answer would be speculative.