A data set on Shark Attacks Worldwide posted on StatCrunch records data on all shark attacks in recorded history including attacks before 1800. Variables contained in the data include time of attack, date, location, activity the victim was engaged in when attacked, type of injuries sustained by the victim, whether or not the injury was fatal, and species of shark. Which of the following questions could not be answered using this data set? (Source: www.sharkattackfile.net) 

a. In what month do most shark attacks occur?

b. Are shark attacks more likely to occur in warm temperature or cooler temperatures?

c. Attacks by which species of shark are more likely to result in a fatality?

d. What country has the most shark attacks per year?