The answer is always C

Any time we had a multiple choice test and I didn’t study at all, I would always choose “c “ to the questions I didn’t know and I passed 💁‍♀️🤣

Buuuuut 28 = 7*4 and 21 = 7*3 so those are related too using the table of 7. 😌

Shit I do that all the time!

D. All the above

[youtube=https://www.youtube.com/watch?v=aV69I6-2G0o]