Answer: C. are fonder of sweets than most people
Step-by-step explanation:
Option A is incorrect because the passage didn't talk about how eating sugar was unhealthy to the English.
Option B is incorrect because it isn't written that English eat desserts at every meal.
Option D is incorrect because the information given about the English doesn't necessarily mean that they have more cavities than any other people.
Therefore, the correct option is C because the English are fonder of sweets than most people.