Question

what makes enforcing safety standards a challenge for the food and drug administration?
many foods are imported from other countries, and the fda must ensure those foods meet the same standards as us goods.
the fda faces competition from the epa, which sets standards for product labeling.
the fda has no control over advertising laws, which may conflict with safety standard laws.
many raw materials are exported to other countries, and the fda must ensure those materials meet the same standards as international goods.

Explanation:

The FDA has to regulate imported foods to meet US - level safety standards. Imported foods from various countries with different initial regulations pose a challenge for the FDA to enforce consistent safety standards. The other options are incorrect as the EPA's role in product - labeling is not a main challenge for FDA's safety - standard enforcement, the FDA has some control over advertising related to food and drugs, and the FDA's main focus is on imported foods rather than exported raw materials for safety - standard enforcement.

Answer:

Many foods are imported from other countries, and the FDA must ensure those foods meet the same standards as US goods.