Answer:
d) Resistor
Step-by-step explanation:
Lets discuss all one by one
A) Conductor : in this type of material the electrons or charge can move without any resistance
B) Circuit : It is the closed path which may contains battery and other components in which current will flow.
C) Insulator : in these type of materials the current can not flow as there is no free charge present in it.
D) Resistor : these are the materials in which charge flow will experience resistance to flow.
So here correct answer will be
D) Resistor