Let's analyze each option:
(1) FDA (Food and Drug Administration):
The FDA is responsible for regulating food, drugs, and other medical products in the United States. This includes the mass cultivation of animal cell cultures, particularly in the context of biological products, cell therapies, and medical applications. Hence, this is the correct answer.
(2) WHO (World Health Organization):
The WHO focuses on global health issues and policy. While it may provide general health guidelines, it does not oversee cell culture regulations in the United States. Therefore, this is not the correct answer.
(3) EMA (European Medicines Agency):
The EMA is the regulatory body for medicinal products in the European Union. It does not oversee guidelines in the United States, so this is not the correct answer.
(4) USDA (United States Department of Agriculture):
The USDA deals with agriculture, food safety, and animal health but does not regulate mass cultivation of animal cell cultures. Hence, this is not the correct answer.
Conclusion:
The correct answer is Option 1: FDA (Food and Drug Administration).