Standards designed to promote human welfare by protecting agriculture crops, livestock, property and the environment in general are called:

The correct answer identifies secondary standards, which are developed primarily to safeguard human welfare and ensure the health of agricultural crops, livestock, and the environment. These standards often address the potential secondary effects of pollutants or environmental contaminants, focusing on protecting not just immediate human health but also the broader ecosystem upon which agriculture and livestock depend.

Secondary standards take into account the long-term impacts of environmental hazards, ensuring that not only are immediate threats minimized, but future risks are also addressed, promoting sustainable practices in agricultural and environmental management.

This means that while primary standards typically set limits for pollutants to protect public health, secondary standards are more about the overall welfare of agriculture and the environment, thereby contributing to human welfare indirectly through ecological health.