Final answer:
The question about the National FFA Convention delegate count cannot be answered with the provided information. For the second question, the correct answer is that the 115th Congress of the United States had 21.2% of women as elected officials.
Step-by-step explanation:
The answer to the question about the first National FFA Convention is not directly provided within the reference information given. Therefore, I am unable to answer the question regarding how many delegates were at the first National FFA Convention. However, for the 115th Congress of the United States, the correct percentage of elected women officials is 21.2%, which corresponds to option b.
The other historical event mentioned refers to the nomination of presidential candidates during a convention, which suggests delegates taking significant actions in political processes. It is not related to the FFA or its conventions.