The correct answer is: C. Schering bridge.
A Schering bridge is a type of bridge circuit used to measure the capacitance and dissipation factor of capacitors. It is particularly suitable for measuring high-voltage capacitors, as it can withstand high voltages without breaking down.
A Wein bridge is another type of bridge circuit that can be used to measure capacitance. However, it is not as suitable for measuring high-voltage capacitors as the Schering bridge.
Option D is incorrect, as the Schering bridge is not the only type of bridge that can be used to measure high-voltage capacitors. The Wien bridge can also be used, but it is not as suitable for this purpose.
Option E is also incorrect, as the Schering bridge is a suitable bridge for measuring high-voltage capacitors.