PowerPrep1|Why is option three wrong?

this will be the last waring to add PowerPrep/PowerPrepPlus Spoiler to the post before posting otherwise the post will be removed

Let me add it

I have done it for the past posts but from here on please remember to add spoiler waring as people who haven’t taken the test yet will get exposed to the questions unknowingly.

I am so sorry for not adding the tag. Didn’t know. Apologies