The correct answer is A. Reduction of water usage
Step-by-step explanation:
One of the main issues in meat production that affect the environment is the use of water involved in the process because this natural resource is used in most stages including production and processing. Indeed, it is estimated to produce only a pound of beef around 1800 gallons of water are used, this leads to less fresh water available as well as more water contamination because the water used is polluted during the process and later these pollutants end in the soil, rivers, lakes, etc. Due to this, by consuming less meat the amount of water used for producing meat will decrease and therefore the environment should be benefited. Thus, the benefit that can be inferred from consuming just 15% less meat is "reduction of water usage".