Professor Moore's data on swimming time and pulse rate were collected over 23 days. Which of the following options best represents the information given?
a) The time taken for swimming was measured in minutes, and pulse rate was measured in beats per minute.
b) The time taken for swimming was measured in yards, and pulse rate was measured in beats per minute.
c) The time taken for swimming was measured in minutes, and pulse rate was measured in yards per minute.
d) The time taken for swimming was measured in yards, and pulse rate was measured in yards per minute.