The correct answer is:
(c) Op-amp 709
The Op-amp 709 is an example of an op-amp that requires an external compensating network. It is a high-speed, high-gain operational amplifier, but it does not have internal compensation. As a result, an external compensating capacitor is necessary to ensure stability and reduce the risk of oscillations, especially in high-frequency applications.
On the other hand, other op-amps like the Op-amp 741 and Op-amp 351 have internal compensation that allows them to operate without the need for external components to stabilize the frequency response.