A school has four sections A, B, C, D of Class IX students.If the number of students passing an examination be considered a criteria for comparision of difficulty level of two examinations, which of the following statements is true in this context?

• A. Half yearly examinations were more difficult.
• B. Annual examinations were more difficult.
• C. Both the examinations had almost the same difficulty level.
• D. The two examinations cannot be compared for difficulty level.