Final answer:
The best example of a good is the birthday candles purchased for a sister's birthday cake.
Step-by-step explanation:
The best example of a good from the given options is the birthday candles you purchased to go on your sister's birthday cake. Goods are physical items that are bought and consumed or used to fulfill a need or want. In this case, the birthday candles are a physical item that was purchased for a specific purpose, which is to go on the birthday cake for your sister's birthday.