Answer: A. speak a specific way
Roosevelt is saying that various new regulations came up that were couched, or worded, in a specific way. In other words, he is saying how the jargon is only for a few people to understand. Those people being familiar with banking terms. So he's using this speech to try to help translate what is going on. The context of this deals with the market crash and great depression, and the many banks that failed around this time period.