💡 Detailed Explanation
The woman is telling Yamada-san that his presentation was well-received. When praised like this, it is common in Japan to respond humbly. Answer 1, 'Not at all, it's all thanks to everyone's help,' is a humble expression that denies one's own achievement and shows gratitude to others, making it the most appropriate response. Answer 2 lacks humility and can sound a bit self-satisfied. Answer 3 gives an impression of being indifferent and slightly rude.