$Ans: D$
The value inside the node is array index
Parent of $4: \left \lceil \dfrac{i}{2} \right \rceil-1=>2-1=>1$
Parent of $3: \left \lceil \dfrac{i}{2} \right \rceil-1=>2-1=>1$
Parent of $2: \left \lceil \dfrac{i}{2} \right \rceil-1=>1-1=>0$
Parent of $1: \left \lceil \dfrac{i}{2} \right \rceil-1=>1-1=>0$