Consider the following statements: 1. Ramjets work most efficiently at supersonic speeds around Mach 3 and can operate upto speeds of Mach 6. 2. A ramjet engine is an improvement over the scramjet engine. Which of the statements given above is/are correct?

• A. 1 only
• B. 2 only
• C. Both 1 and 2
• D. Neither 1 nor 2