D is the sister of E.  A is the father of D.  F is the son of E.  C is the maternal grandfather of V.  A does not have married daughter. How is D related to F ?

Aunt

↑ or ↓ ⇒ Upward or downward line shown "generation gap" .

   =    ⇒ Double lines shown "relation b/w Husband & Wife"

   —   ⇒ single line shown "relation in same generation other than Husband & Wife".

   +   ⇒ Plus sign shown " Male".

   -   ⇒ Plus sign shown " Female".

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So, the correct answer is option 2.