A Scientist Wants to Test the Hypothesis That a Certain

A scientist wants to test the hypothesis that a certain bird species in her back yard changes its songs to warning calls whenever it detects the presence of a potential predator.Which of the following most likely describes her initial observations?

A) The scientist noticed that whenever she opened a door to her house, she heard birds beginning to sing.
B) Each time the scientist let her cat outside, the birds abruptly changed their songs.
C) The scientist noticed that the birds only appeared at certain times of the day, always singing the same song during those times.