When the rules mention SMB2, does that mean Lost Levels (or SMB2J) or the American release of SMB2? If it’s the latter, that means I won’t be able to run the category... please answer ASAP!

Well it's the "NES Trilogy" category, so that would be SMB2 (US Version). SMB2J is an FDS game. Looking at any of the runs also answers that question.

Thanks for your help! I won’t be able to do this category, but I appreciate your answer.