The correct answer should be C. bio-luminescence
They have this ability because the parts that are shiny are meant to be like bait for other animals and when they come near to eat it or check it out they get eaten by the entire fish which is much larger than its bioluminescent part.
I think the baby kangaroos have a pretty sweet ride they just kinda chill in the pouch till they get where they’re going. If australia got rid of their cars and started implementing more kangaroo friendly roadways perhaps they could create new infrastructure to involve kangaroos in the transportation industry.