Choose the letter A, B, C or D to answer these following questions

Hello everyone. My name is Dung. Now I’m twelve years old and I’m a student. I have a sister named Huong. She is twenty years old. We live in a small house near the lake. Our house has a beautiful yard. There is a river and a lake. There is a park near the lake. There is a restaurant opposite the park. In the park, there are so many flowers and trees. Near our house is a stunning field.

How old is Dung?

A. 13

B. 12

C. 15

D. 20