Dairy farmer: On our farm, we have great concern for our cows' environmental conditions. We have recently made improvements that increase their comfort, such as providing them with special sleeping mattresses. These changes are intended to increase blood flow to the udder. This increased blood flow would boost milk output and thus increase profits. Of the following propositions, which one is best illustrated by the dairy farmer's statements? ['Farming practices introduced for the sake of maximizing profits can improve the living conditions of farm animals.', 'More than other farm animals, dairy cows respond favorably to improvements in their living environments.', 'Dairy cows cannot have comfortable living conditions unless farmers have some knowledge about the physiology of milk production.', "The key to maximizing profits on a dairy farm is having a concern for dairy cows' environment."]