A is the answer because this the only thing that folds
The right option is A. the beaks of finches. which he observed on Galapagos Island.
Based on the information above, the correct answer to the question would be a. Percy will likely make an external attribution. Since he does not remember anything that would cause him to think that he can be a reason why one of his windows is broken, then he most probably will attribute it towards an external event.