Paheli is running short of connecting wires. To complete an electric circuit, she may use a

Glass bangle, thick thread and rubber pipe metal all are non-metal while steel spoon is a metal thing. And we know that only metals conduct electricity that's why they are conductors and non-metals do not conduct electricity that is why they are insulators. Glass, thread and rubber are insulators and steel spoon is a conductor. Hence, insulators does not allow the current to flow that is why option (a),(b) and (c) are not right option and only (d) is the correct option which does allow current to flow and will let the bulb glow.

The key difference between conductors and insulator is that conductor conduct electricity while insulators do not.