What issue is related to a sticking shift selector in an automatic transmission?

A sticking shift selector in an automatic transmission typically affects the transmission's ability to change gears smoothly, which can lead to problems during the shifting process. In the scenario of a sticking selector, the transmission may not accurately respond to the driver's commands, particularly when shifting from one gear to another.

When considering the provided option about the failure to upshift while in low gear, this correctly identifies a potential symptom of a sticking shift selector. The driver may experience difficulty moving from low gear to a higher gear when requested, as the selector is not functioning properly to signal the transmission to perform that upshift.

The other options present different issues related to an automatic transmission, but they do not directly correlate with the specific problem of a sticking shift selector. For instance, the inability to shift into low gear can be related to other issues, such as problems with the transmission itself or the linkage, while the failure to engage neutral indicates another distinct malfunction in the transmission system. Additionally, allowing the engine to start in any gear points to issues with safety interlocks, which are unrelated to the sticky nature of the shift selector itself.