Read the given question and decide which of the following options is additionally required to answer the question?Question:The students of a school received their final exam results. All the students had passed the exam and each one secured a unique rank. Bhavna secured 5th rank and had 2 girls ahead of her and 7 boys behind her. What is the total number of students in the class?

• A. 6 girls were behind Bhavna
• B. The class has a total of 9 boys
• C. There were 2 boys ahead of Bhavna
• D. There are more boys behind Bhavna, than ahead of her.