The answer is B because it doesn't have any commas and it wouldn't make sense without it. Looks like you got it correct.
Full of excitement, today was an excellent day, up until I got into a huge argument with my friend, while I kept a gentle temperament he/she did not do the same.
Skimmed over the text, and or reading it quickly
A Mini motor car fitted with a high-powered engine and disc brakes.
