Question

sophisticated means :
relating to times long past
causing or marked by grief or anguish
intellectually appealing
possible but not certain to occur

Explanation:

The word "sophisticated" has several meanings, but "intellectually appealing" is a common and accurate definition. "Relating to times long past" is more for "ancient" or "antique"; "causing or marked by grief or anguish" is for words like "distressing"; "possible but not certain to occur" is for "probable" or "contingent".

Answer:

intellectually appealing