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.
Spotless
An adjective describes something, so the kitchen is being described as spotless
<span>A monologue is a speech made in the presence of other characters, while a soliloquy is always made when the character is alone. </span>
Richard Gere born Aug. 31, 1949
J.K. Rowling born July 31, 1965
Nicole Kidman born June 20, 1967
earliest born was Richard Gere