How many states adopted the National constitution along with Missouri in 1948?

In 1948, when Missouri adopted the National DECA constitution, it was part of a larger movement where several states joined in this initiative to create a unified framework for the organization. The correct response reflects that a total of 17 states made this significant decision alongside Missouri.

This reflects the expansion and establishment of DECA at a national level, where membership was essential for creating cohesive guidelines and supporting local chapters throughout the United States. The number 17 signifies a considerable commitment from states during this time to unify and strengthen the DECA organization, making it more effective in promoting career and entrepreneurial education among high school students.

The other options do not accurately reflect the number of states that acted in concert with Missouri in that pivotal year, highlighting the collective effort in shaping the future of this organization at a formative stage.