Answer: A. Synonyms
The words contemporary and modern are synonymous to each other. The two words both are associated to the recent times or the present. Synonyms are words with the same meaning while antonyms are those with opposite meanings. Here are some of the sentences that use the words modern and contemporary.
The modern times is quite slippery for the youth.
Contemporary music is continuously evolving.
The modern clothing fashion is always in.
Contemporary dances looks like revised folk dances.