Final answer:
The best definition of environment in terms of health is 'Physical surroundings,' as it encompasses external factors that influence human health, including both biotic and abiotic components, and promotes behaviors that fulfill biological health needs.
Step-by-step explanation:
The best definition of environment as it relates to health is a) Physical surroundings. Environmental health is principally concerned with preventing negative health outcomes by addressing adverse environmental conditions and promoting behavioral changes that align with our biologically determined health needs. This includes both the physical aspects—like clean air and water, and the interaction between organisms and their abiotic environment, which encompasses the non-living parts of an environment such as temperature and oxygen concentration—as well as promoting lifestyles that ensure well-being, such as a healthy diet and regular physical exercise.
The environment and our health are intricately linked, with our surroundings dictating the possibility of an organism's existence and influencing its behavior. Therefore, the conditions provided by the environment play a crucial role in shaping overall health and well-being, even in urban settings, where environmental risks can lead to major health issues like various types of cancers.