Bonjour,
Réponse :
a. Abraham Lincoln was the tallest president ever in the White House: he was six foot four (= nearly- 2 metres) tall. He was also the most honest, that's why his nickname was "Honest Abe".
b. Thomas Edison was the youngest American inventor: He started when he was 16. He became the best inventor of modern times when he invented the light bulb, his (important) discovery.
c. Ellen MacArthur broke the world record for the fastest solo travel around the globe on 7th February 2005. She is the bravest sailor I've learnt about. She is also the youngest person to be awarded the title of Dame Commander of the Order of the British Empire.
Explications :
https://nosdevoirs.fr/devoir/3923622 Fiche comparatif/superlatif