well, as far as i know in a regioselective reaction,bond formation occurs in one direction, and chemoselective is when a reagent prefers to react with a particular functional group.but what i know is just the theory and i am not sure how it works in a reaction like this.
Ok good! Now, in order to answer this question, you need to be able to draw the mechanisms for these reactions. For each reaction, you need to consider two things:
To consider regioselectivity, you need to look at where bond formations occur, and see if it could occur in a different direction. This is typically things like markovnikov addition, and such. However, wikipedia uses the example of a strong base and the choice between two different protons to abstract (however, I've always heard this referred to as chemoselectivity).
To consider chemoselectivity, you need to look at what the reagent is reacting with. See if there are any other locations or groups that the reagent could react with.
Don't worry about the whole reaction, just take each reaction step-by-step. Provide your guesses and thoughts and we can go from there.
EDIT: Also, how does the transformation from A to B happen? If this is how the information was handed out from your teacher, I would instead suggest you speak to them, as there is information missing.