The correct answer is C. A research paper
Explanation:
The word syntax refers to the way we use words to create sentences, paragraphs, and texts that are coherent and correct according to grammar. This means the syntax is related to the structure and rules used in a language to convey a message. Additionally, the syntax can be classified as formal if it follows all the rules of grammar, uses technical or sophisticated words and avoids informal syntax such as contractions or incorrect word order or as in informal if grammar is not used all the time and there are contractions or other features that are not formal in the structure of sentences and paragraphs.
Generally speaking, the informal syntax is only used for informal texts such as narratives including short stories, poems and personal essays or informal messages with people you know for example letter or e-mails to friends or relatives, while formal syntax is used in academical contexts including argumentative essays, articles, and research paper. Considering this, the use of informal syntax would not be appropriate for a research paper as this belongs to the academical context and requires to follow syntax and grammar rules strictly or in a formal way.
