How many students are there in her class

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

Nga lives in the city. Every morning she gets up at 6. 30. She brushes her teeth. She washes her face. She has a big breakfast. Then she gets dressed. She goes to school at 6:30. She is in grade 6. Her classroom is on the second floor. It is very big. There are 42 students in her class. She loves her friends and teachers very much.

How many students are there in her class?