Konopka and Benzer isolated mutant fruit flies that had abnormal daily (circadian) rhythms. The graph below shows the number of fruitflies that eclose each hour of the day (eclosion means emergence from the pupal case). Which of these statements can be reasonably deduced from the given data?
a. The wildtype has a 24 hour rhythm
b. The mutation in Mutant 1 causes lethality
c. The rhythm is abolished in Mutant 2
d. Mutant 2 and Mutant 3 have mutations on different protein-coding genes