Final answer:
The term 'donned' means that Sahomi wore the costumes. It is a formal way of saying that a character has put on clothing, often significant in transforming into another role or character.
Step-by-step explanation:
In the context of the story, when it is said that 'Sahomi donned beautiful costumes,' the term donned means that Sahomi wore the costumes. The verb 'to don' is a formal term that means to put on an item of clothing. Therefore, the correct answer to the question is a) Wore.
When an actor or character in a story donned costumes, they are doing so to take on the appearance or role of someone else. A costume in this sense is more than just clothing; it is an essential part of the persona that the character is trying to convey.