Final answer:
The National FFA Chorus was formed in 1948 and plays a role in the National FFA Convention & Expo.
Step-by-step explanation:
The National FFA Chorus was formed in 1948. The chorus is an integral part of the National FFA Convention & Expo and provides an opportunity for FFA members with musical talent to perform at a national event. Members of the National FFA Organization, formerly known as Future Farmers of America, come together during the convention to celebrate their accomplishments and inspire others through music. The correct answer to the question is option (a) 1948.