Scientists studying penguins in the Antarctic used to attach metal bands to one of the penguin's flippers. However, it was suspected that these bands may affect on the penguin's ability to survive and reproduce. A longitudinal study of 100 King penguins (50 banded and 50 unbanded) measured whether they survived the first year, whether they survived for ten years, how many chicks they successfully raised, and how long they spent foraging for food on each hunting trip. Which of the variables measured in the study is continuous? O whether or not they survived for 10 years O how many chicks they raised how long they foraged for food O whether the penguin was banded or not