I think it would be answer D, to introduce an idea because it's introducing the idea of a Venus Fly Trap's diet.
A couplet can best be defined as (C) a group of two lines of verse.
These lines often rhyme and have the same meter pattern.
A) my teacher refused to let me leave early.
b) jill continued to sing for an hour.
c) it seems you have passed the exam.
d) richard expects that he is going to do well.
e) what do you intend to do this summer?
f) i hate cleaning my room.
g) helen agreed to go to the cinema with me.
h) tina and brian have decided to get married.
i) i hope to see you later.
j) what do you want to do this evening?
Answer:
D. Clearly, Directly, and Briefly
Explanation: