Final answer:
The correct answer is 'A) Contextual,' as contextual clues are typically placed within a long sentence, after a comma, and near the end for emphasis and clarity.
Step-by-step explanation:
The student's question relates to the types of clue words that can be found in sentences and their positions. According to the given choices, the best answer would be Contextual clues. These clues are pieces of information within a text that a reader can use to understand the meaning of a new word or phrase. Writers often place these contextual clue words after a comma, within one long sentence, and near the end, as this is where emphasis is usually best realized, and where they can be most effective in clarifying or adding to the meaning of the content that comes before.
It is also important to follow certain principles, such as the short-to-long principle when listing elements in a sentence, and understanding the structure of subordinate and main clauses in complex sentences, to make writing as concise and clear as possible for better readability and flow.