Majority of the pteridophytes are
I. Homosporous and produce only one kind of spores. 
II. Aquatic in nature. 
III. Heterosporus and produce small and large spores. 
IV. Restricted to narrow geographical zone because of specific requirement of water. 

• A

   I and II

• B

  II and III

• C

  III and IV

• D

  IV and I