The jet aircrat flies very easily and smoothly in the lower stratosphere. What could be the appropriate explanation ? EXPLANATION: (I) There are no clouds or water vapour in the lower stratosphere. (ii) There are no vertical winds in the lower stratosphere. Which of the above explanation is/are correct in this context ?.

• A. Only (i)
• B. Only (ii)
• C. both (i) and (ii)
• D. neither (i) nor (ii)