Answer:
B (5 centimeters)
But it should be correct A (3), because in this time we do not use a cage, so our birds will eat from their natural food source of worms and insects around us which have been collected by parents to bring them up until they are ready or else become adults who can fly away themselves... I hope you understand what i'm trying explain here.. Thanks :). Any feedbacks would also appreciated! Cheers~ :D
