Mastering Java: The Ultimate Quiz for 'Thinking in Java

The BufferedInputFile example uses the `readLine()` method to read a file, making option A the correct answer. The other options are incorrect because

- Option B, `read()`, reads only a single character at a time, which would not be efficient in reading an entire file.

- Option C, `inputStream`, is a data stream but is not specifically used for reading files.

- Option D, `BufferedReader`, is a type of character stream that wraps around other underlying streams, but does not specifically read files.