a) Only the 5th level.

b) Only the 3rd level.

c) At both the 3rd and 5th levels.

d) At the 3rd, 4th and 5th levels. (3rd: plants, beetle, snake or plants, sparrow, snake), (4th: plants, beetle, mantis, snake), (5th: plants, beetle, mantis, toad, snake)

------- ------------