Q: You are presented with the quiz "What are terrific for plants?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "annelids are worms such as the familiar earthworm" and "earthworms are terrific for plants and soil". So, what's the best answer to the question?

OPT:
(i) good.
(ii) cacti.
(iii) Chlorophyll.
(iv) annelids.
(v) storms.
(vi) bugs.
(vii) dust.
(viii) bees.
The answer is:
(iv)