How long after the application of synthetic auxins does plant death typically occur?

Synthetic auxins are a class of herbicides used in agriculture that mimic plant hormones and disrupt normal growth processes. When applied to weeds or undesirable plants, these chemicals can induce uncontrolled growth patterns leading to eventual plant death. The effects of synthetic auxins do not manifest immediately; rather, they require time to affect the plant's hormonal balance and physiological functions.

Typically, it may take more than three weeks for the full impact of synthetic auxins to result in plant death. During this period, the weeds will undergo a range of growth changes, including abnormal elongation and distortion of stems and leaves. This delayed action is why individuals using these herbicides should be monitoring the treatment area over several weeks to assess effectiveness and make any necessary follow-up applications.

In the context of the options provided, the timeframe of more than three weeks is most appropriate, reflecting the gradual progression of effects following the application of synthetic auxins in plants.