The sentence which contains an error in apostrophe usage is the first one - What did you do with the houseplant's I bought yesterday?
The error is in the word "houseplant's" because that apostrophe is redundant, meaning that you don't have to use it here because it changes the meaning. You want to say that there are more than one houseplant, and to create the plural form, you just need to add -s, without the apostrophe.
