A transfer of energy in practice means that one organism eats the other organism, so here we have to ask whether the first organism is eaten by the second.
A. from rabbits to green plants
Plants don't eat rabbits so -no!
B. from weasels to eagles
-this is the correct answer! Eagles do prey on weasels and eat them whenever they can
C. from eagles to rabbits
Rabbits don't eat eagles -so, no!
D. from green plants to weasels
Weasels are predators so they don't eat plants!
