Which water polo club, based in Piraeus, has won multiple LEN Champions League titles including in 2002 and 2018?

• A Vouliagmeni
• B Olympiacos Piraeus ✓
• C Ethnikos Piraeus
• D NO Patras

Olympiacos Piraeus men's water polo team has won the LEN Champions League multiple times, including in 2002 and 2018, and dominates domestic competition with dozens of league titles.