question_answer

The ideal conditions for flying jet aircraft are provided by stratosphere because

I. There are no clouds and other weather phenomenon.

II. Uniform temperature increases engine efficiency.

III. The presence of ozone gas increases fuel efficiency

IV. Air resistance is at its maximum.

Which statement is/are correct?

A)  Only I         

B)  I and II

C)  I, II and III      

D)  I, II, III and IV