Which group of amino acid synthesis inhibitors poses a risk of ground water contamination due to heavy rain?

The correct answer highlights the group of amino acid synthesis inhibitors, specifically Arsenal, Chopper, and Stalker. These herbicides are known to have persistence in the environment, particularly in soil and water systems. Their chemical properties can lead to leaching, especially under conditions of heavy rain. When rain causes increased water movement through the soil, these compounds can be washed into groundwater systems, posing a risk of contamination.

In contrast, other herbicides listed may not have the same level of persistence or risk under similar environmental conditions. For example, Oust and Glyphosate have different modes of action and chemical structures that generally do not contribute to groundwater contamination in the same way as the specified group. Telar, while also a herbicide, is not primarily classified as an amino acid synthesis inhibitor and typically presents lower risk in terms of groundwater leaching when evaluated under similar circumstances.

Understanding how different herbicides interact with environmental conditions is critical for proper application and management to mitigate risks, especially concerning water resources.