A promise to rebuild the engine of B$\text{'}$s car in exchange for B$\text{'}$s negotiation to him of a promissory note in the amount of $$800.$ If A never rebuilds the engine

A is a holder in due course because his promise constitutes valid consideration.

A gave value for the note in good faith, he intended to rebuild the engine he just never got time.

A cannot qualify as a holder in due course because he is a merchant.

A cannot qualify as a holder in due course because he did not give value for it$.$