The correct answer I got was "The teacher who pioneered MinecraftEdu". I researched about Santeri Koivisto, and it read that he was a teacher.
Proof from the other answers:
I searched up the writer of Markus Persson's biography, and it was written by Tamra B Orr, so B is incorrect.
The developer of the original Minecraft game is of course Markus Persson, so D is incorrect. If he was the original Minecraft creator, then we would all be crediting him instead of Markus Persson.
I wasn't told who the first educator was, but I tried that one and I got it incorrect, so A is wrong.
And that leaves us with C, "The teacher who pioneered MinecraftEdu". I hope you understand this, and good luck with your future assignments :)
Also, sorry this is late!