Correct Answer: ancient

Solution : The correct choice is the second option .

The word modern refers to something current, contemporary, or up-to-date. In this context, ancient serves as the antonym, as it signifies something old, historical, or from a distant past.

The meanings of the other options are as follows:

• Creaky : This typically describes something that makes a harsh, high-pitched sound when moved or when pressure is applied, often due to being old or not well-lubricated.
• Popular : Something that is liked, admired, or enjoyed by many people. This can refer to trends, individuals, opinions, etc.
• Well-Known : This indicates something or someone that is widely recognised or familiar to many people.