Answer: D. categorical data
Explanation:
There are two main kinds of data a) Quantitative data b) Qualitative data.
Qualitative data is also known as categorical data that do not have any logical order, and it cannot be converted into numerical values.
Given statement : Biologists are keeping track of the different kinds of fish in Lake Michigan.
It means Biologists are keeping track of different categories of fishes.
Hence, It is a type of categorical data.