Combinational Circuits:
Combinational circuits are a type of digital circuit where the output depends only on the current input. There is no feedback or memory element in these circuits. The output is determined solely by the combination of the input values and the logic gates used in the circuit. The operations performed by combinational circuits are generally faster because they do not have any memory elements and the output is generated immediately based on the input. Therefore, the propagation delay through combinational circuits is usually shorter compared to sequential circuits.

Sequential Circuits:
Sequential circuits are another type of digital circuit that includes memory elements. These circuits have feedback, and the output is not solely determined by the current input but also by the previous inputs and the state of the memory elements. Sequential circuits have a clock signal that synchronizes the operation of the memory elements. The propagation delay in sequential circuits is generally longer compared to combinational circuits because the output depends on the clock cycle and the time required for the signals to propagate through the memory elements.

Latches:
Latches are basic memory elements used in sequential circuits. They are level-sensitive and can store one bit of information. Latches have a setup time and a hold time requirement, which means the input must be stable for a certain period before and after the clock edge to ensure proper operation. The operation of latches is relatively slower compared to combinational circuits because they have memory elements and setup/hold time requirements.

Flip-flops:
Flip-flops are another type of memory element used in sequential circuits. They are edge-triggered and can store one bit of information. Flip-flops operate on the rising or falling edge of the clock signal. Similar to latches, flip-flops have setup and hold time requirements. The propagation delay in flip-flops is longer compared to combinational circuits due to the presence of memory elements and clock synchronization.

Conclusion:
Among the given options, combinational circuits tend to have faster operations compared to sequential circuits, latches, and flip-flops. This is because combinational circuits do not have memory elements and the output is solely determined by the current input. Sequential circuits, latches, and flip-flops involve feedback and memory elements, which introduce additional delay in the circuit operation. However, it is important to note that the speed of operations also depends on various other factors such as circuit complexity, technology used, and design optimizations.