Where´s the poem? so I can try to help
Since Gatsy first met Daisy, five years have passed because he has been away at war and then involved in business to make the money he believes he needs to win Daisy's love. Not until he is rich does he arrive at West Egg. In the meantime Daisy has married Tom Buchanan and had a daughter, Pammie. Gatsby also threw huge parties hoping that Daisy would one day stumble across the party. He even bought a house across from hers.
Answer:
A. The results of the experiment showed a quantifiable decrease in oxygen levels.
Explanation:
The chosen sentence possesses a formal register with technical vocabulary related to science, which can be understood by professional scientists. For instance, the words <em>quantifiable </em>and <em>decrease </em>have a more academic style. Besides, the writing is impersonal and written in the third person.
The rest of the options are incorrect because they have contractions and they are too informal. Thus, their vocabulary contain casual expressions which do not follow the conventions of an academic style.
I'd say it's not very reasoning.
Hope this helps.
Can you post the story if you have it