Final answer:
A significant action during Red Nose Day is the Red Nose auctions, which raise funds for children in poverty by auctioning items and experiences.
Step-by-step explanation:
Red Nose Day is a campaign dedicated to raising money for children living in poverty by simply having fun and making people laugh. One of the significant actions organized during Red Nose Day to support people in need is B) Red Nose auctions. These are events where special items and experiences are auctioned off to raise funds for the cause. The funds raised through Red Nose Day are used to support projects ensuring children are safe, healthy, educated, and empowered across the globe, including in America, Africa, Asia, and Latin America.