Which of the following are correct for gymnosperms?
I. Have mainly adventitious root system. 
II. The leaves in gymnosperms can withstand extreme temperature, humidity and wind. 

III. Microspores are produced in microsporangia. 
IV. They include medium or tall sized trees and shrubs. 

• A

  I and III

• B

  I, II and II

• C

  II, III and IV

• D

  I and IV