Thread: English punctuation

This is what I would use:
what it was about, who did it, and why?

Yes, when you have a list A, B, and C you need all commas. See Strunk & White.

These sources are in English; however, it might be of help to everyone as they cover many rules and have examples of both correct an incorrect usage. It is from Purdue University:

Commas: Quick Rules
Extended Rules for Commas
Commas After Introductions
Commas vs. Semicolons
Commas with Nonessential Elements