Hey there! I am happy to help!
I recently read a fictional book called Breaking Stalin's Nose by Eugene Yelchin and it was about a young boy who accidentally breaks a statue of Stalin before his pioneer ceremony. It was a lot like Scouting if you are familiar with that.The young boy was obsessed with Stalin as well.
We have four answer options for what the Young Pioneers was: a school, all Soviet children, anti-Stalin activists, and a communist youth organization. Well, from the book we know that it is not a school, not all of the Soviet Children, and not an anti-Stalin activist group.
Therefore, the answer is a communist youth organization.
Have a wonderful day! :D
