D.she developed the theory of radioactivity.
The conflict of this play is that Mr. Teller wants his puppy back. We know this because June says to Mr. Teller that they didn't think he would come to take the puppy back home. Mr. Teller says he told them he'd come back when he dropped the puppy off.
They are not in the cartoon above because they wouldn't fit. i think that may be the correct answer.
The use of the refrain does not contribute to the meaning of the poem.
