AT THE BEGINNING HE SEAMS ANGRY AND UPSET BUT IN THE END HIS WHOLE MOOD CHANGES
The tone( speakers attitude)can be frightened or grim and the mood (emotional affect the text gives the readers) can be worried or tense.
B.
How could you find something if you don't know what you're looking for?
The correct answer is I and III only.
When you read a text and want to decide what the author's purpose for writing it was, then you need to take a look at the evidence he or she presented, as well as whether or not that evidence was appropriate. What is irrelevant here, however, is how fast or how slow you read the text - that has nothing to do with the author's purpose.