Answer:
Here 21 is a discrete number, hence, it is a quantitative data.
Explanation:
Quantitative data is that data which gives information about quantities. The information can be written in numerical forms. Like a person's height, number of students in a class etc.
Categorical data divided the information under different categories like the race and sex of person.
Continuous data gives values within a complete range. Like all the students height in a class falls in what range.
Here, we have been given that -a forester counted the number of limbs on a 2-year-old tree to be 21. Here 21 is a discrete number, hence, it is a quantitative data.