Which Experiment Would Be the Least Effective Follow-Up to the Peacock

Which experiment would be the least effective follow-up to the peacock butterfly studies?​

A) ​Repeat in a forest area totally devoid of native butterflies.
B) ​Repeat in a wildlife sanctuary aviary after giving birds a chance to learn about peacock butterflies.
C) ​Repeat using young, inexperienced birds.
D) ​Repeat, and count survivors for three weeks.
E) ​Repeat using more butterflies and more blue tits in a larger area.