In gymnosperms,the root system is $A$. In $Pinus$,symbiosis is observed between $B$ and fungi,which is called $C$.

• A
  $A$ - Fibrous,$B$ - Root,$C$ - Lichen
• B
  $A$ - Taproot,$B$ - Leaf,$C$ - Mycorrhizae
• C
  $A$ - Fibrous,$B$ - Root,$C$ - Antheridia
• D
  $A$ - Tap root,$B$ - Root,$C$ - Mycorrhizae