Answer:
The author includes these sentences in the story mainly to show that Catherine <u>thinks it is important to help others.</u>
Explanation:
The short story "The Mysterious Box" tells how the two siblings Samuel and Catherine discovered <em>"a hidden treasure"</em> in their new house. And though this treasure was different from what Samuel wanted and expected to find, they nevertheless helped recover a lost treasure of the previous owner.
In the given excerpt from the story, the siblings found a trunk while cleaning the attic. And upon discovering clothes still in good condition,<em> "Catherine decided to donate them to the school's drama department." </em>This shows how considerate Catherine is, and her belief in the importance of helping others.
Thus, the correct answer is option C.
