Final answer:
The example of quantitative data from Jane Goodall's study is 'Mothers and their infants typically nap for two to three hours each afternoon', as it offers a specific measurable period. The correct option is A.
Step-by-step explanation:
In her studies of chimpanzee behavior, Jane Goodall collected both qualitative and quantitative data. An example of quantitative data is 'Mothers and their infants typically nap for two to three hours each afternoon.' This is because it provides a measurable amount of time that can be quantified or counted.
Qualitative data, on the other hand, are descriptive and relate to the characteristics or qualities of something. Examples from the choices given that qualify as qualitative are: 'Chimpanzees typically travel together in small groups,' 'Pairs of animals take turns grooming each other,' and 'Young chimpanzees play games in the trees and on the ground.' These statements describe behaviors but do not provide numerical values.
Jane Goodall's pioneering work, including quantitative observations like napping times, helps scientists understand chimpanzee behavior and its potential evolutionary implications for humans.