Answer:
The SMPTE created an organized system of film technology, development, and distribution.
Explanation:
The SMPTE opened the door for Union organization within the film industry is true but not the most significant outcome of the formation of the SMPTE. However, the second option is certainly the most significant outcome as SMPTE is the most organized system of film technology, development, and distribution. And the other two options are also correct but the most significant outcome of the formation of the SMPTE is the second option.
The answer is visual hierarchy :)
