Question

which is an example of a survey involving quantitative data?
the favorite food of each person
the number of cavities each person has had
the color of the walls in each persons bedroom
the type of car that each person owns

Explanation:

Quantitative data is numerical. "The number of cavities each person has had" is numerical. The other options (favorite food, wall color, car type) are qualitative (categorical) data.

Answer:

the number of cavities each person has had