A prepositional phrase is a group of words that lacks either a verb or a subject, and that functions as a unified part of speech. It normally consists of a preposition and a noun or a preposition and a pronoun.
I had to do this same question on my homework.
The answer is A,
Because the others all need to add a word or too.
Like D.
Either Antonio or Marisol are *going to be* speaking at the meeting.
~itsyourgirlfetty~
Answer:
a. Jenna could make a References page when she begins writing her paper and add sources and in-text citations for all outside sources she uses as she writes her paper.
Explanation:
Plagiarism is referred to the act of using researches done by any other person and declaring it to be theirs. Copying ideas is strictly prohibited in any research. Using information in any research writing can be referred as quotation and the detailed resource should be mentioned in the reference section. In order to avoid plagiarism, a person can prepare the notes and keep a record of all the information citied from any other source. The clear source information should be written for further references.

Sentence is a group of words which makes a complete sense.