It is very difficult to interpret news in foreign exchange markets because

The correct answer is: D. All of the above

Here is a brief explanation of each option:

• Very little information is publicly available. This is because much of the information that is relevant to foreign exchange markets is held by private companies and governments. This information is often not released to the public, or it is released in a way that makes it difficult to interpret.
• It is difficult to know which news is relevant to future exchange rates. This is because the foreign exchange market is a complex system that is affected by a wide range of factors. It can be difficult to predict how any particular piece of news will affect exchange rates.
• It is difficult to know whether the news has been obtained legally. This is because there is a lot of illegal activity in the foreign exchange market. Some traders may use insider information or other illegal methods to gain an advantage.

All of these factors make it very difficult to interpret news in foreign exchange markets. This can make it difficult for traders to make informed decisions about when to buy or sell currencies.