Final answer:
The argument against implicit heap recovery is the lack of control over memory reclamation, as it can introduce unpredictable behavior in critical systems.
Step-by-step explanation:
The argument against implicit heap recovery is C) Lack of control over memory reclamation. Implicit heap recovery, often implemented as garbage collection, automates the process of freeing up memory that is no longer in use by the program. While this can offer benefits such as improved performance and increased simplicity, it takes away the programmer's control over when and how memory is reclaimed. This can be problematic in systems where timing and resource management are critical, as the garbage collector can introduce unpredictable pauses and overhead.