Which of the following door mechanisms meets minimum handicap requirements?

The single action lever door mechanism is designed to meet minimum handicap requirements primarily because it allows for easy operation with minimal effort. This type of handle can be operated with an open hand, forearm, or even by pushing down, which is particularly beneficial for individuals with limited mobility or strength. The design eliminates the need for twisting or gripping, making it accessible to people who may have physical challenges.

In contrast, other options like the knob handle, although common, require a twisting motion that can be difficult for some individuals with disabilities, so they do not meet accessibility standards as effectively. Double action levers might offer some advantages but generally aren't as universally accessible as the single action lever. The push bar is helpful for certain exit scenarios and can comply with accessibility standards, but it often requires more force or coordinated movement than a single action lever, making it less ideal in all situations.

Thus, the single action lever mechanism stands out as the most suitable choice for accommodating individuals who need additional support when opening doors.