Explanation: "Recovery time" refers to the period a receiver needs to regain full sensitivity after being exposed to a strong signal, such as its own transmitter (common in radar). This primarily impacts the *minimum* range capability, allowing nearby signals to be distinguished, but it does not affect the maximum distance a very weak signal can be detected from. * **Carrier frequency (A)** affects maximum range because signal propagation characteristics, such as free-space path loss and atmospheric absorption, vary significantly with frequency. Lower frequencies often propagate further. * **Pulse repetition frequency (C)**, particularly in pulsed systems like radar, directly determines the *unambiguous* maximum range. A lower PRF allows more time for distant echoes to return before the next pulse is transmitted, preventing range ambiguity. * **Receiver sensitivity (D)** is a direct measure of how weak a signal the receiver can detect. A more sensitive receiver can pick up fainter signals from greater distances, thus increasing the maximum range capability.