Question

くま

なぜ1になるのかわかる方いらっしゃったら解説お願いします🙇‍♂️

n doi
Shuntaro has always tried to help the other members of the chess club. He
has been doing so (
) since he became the club’s president earlier this
27
year.
youm
3 all the better
1
all the more
all the best
4 all the most