Final answer:
The primary difference between Sanjay and Emma's careers is that Sanjay prevents disease while Emma focuses on treating it through nutrition plans and interventions.
Step-by-step explanation:
The statement that BEST explains the difference between Sanjay and Emma's careers is that Emma focuses on treating disease, while Sanjay prevents it. Sanjay, as a nutritionist, works to prevent diseases through proper nutrition and lifestyle choices. On the other hand, Emma, as a dietician, focuses on treating diseases through nutrition plans and interventions. For example, Emma may help a patient with diabetes manage their blood sugar levels through a specific diet plan.