Birthdays are personal celebrations for individuals. On this day, people celebrate the anniversary of their birth. Friends and family often give presents, sing 'Happy Birthday,' and eat cake. A traditional part of the celebration is blowing out candles on a birthday cake, one for each year.
According to the text, what is a traditional activity on birthdays?
A) Going trick-or-treating
B) Blowing out candles on a cake
C) Decorating a tree with ornaments
D) Having a big parade in the street