Which sentence explains why subject specific words are important.

A. They inform the reader that the author is an expert in a specific field.
B. They inform the reader that the author is writing about a particular topic.
C. They help the reader to learn new vocabulary words.
D. They help the reader to analyze any type of text, no matter the subject.

A. They inform the reader that the author is an expert in a specific field.

B. They inform the reader that the author is writing about a particular topic.

The correct answer is A. They inform the reader that the author is an expert in a specific field.

To determine the correct answer, we can analyze each option:

A. This option suggests that subject-specific words inform the reader that the author is an expert in a specific field. This is likely to be true because when an author uses specialized terminology or vocabulary related to a specific subject, it indicates their knowledge on the topic.

B. This option states that subject-specific words inform the reader that the author is writing about a particular topic. While this can be true, it is not the primary purpose of subject-specific words. The focus is more on showcasing expertise rather than simply indicating the chosen topic.

C. This option suggests that subject-specific words help the reader to learn new vocabulary words. While it is possible for readers to learn new words by encountering subject-specific terminology, the primary purpose of subject-specific words is not to teach vocabulary.

D. This option states that subject-specific words help the reader to analyze any type of text, no matter the subject. While it is true that subject-specific words can assist readers in analyzing and understanding texts within a specific subject area, they may not necessarily be applicable to analyzing any type of text in general.

Thus, option A is the most accurate explanation as subject-specific words indeed inform the reader that the author is an expert in a specific field.