Final answer:
Richard I, commonly known as Richard the Lionheart, is historically renowned for his skill in leading sieges against enemy cities, thus making him the commander who excels at attacking enemy cities.
Step-by-step explanation:
The question asks which of the listed commanders is known for excelling at attacking enemy cities. Out of the options given, B) Richard I, also known as Richard the Lionheart, is historically recognized for his military prowess, especially during the Crusades where he led sieges against enemy cities. While Cao Cao, listed as option D), was indeed a powerful warlord during the Three Kingdoms period in China, known for his strategic capability on the battlefield, the primary context of his notoriety is more connected to his role in consolidating power and governing rather than strictly attacking enemy cities. Therefore, Richard I would be the correct answer for a commander who excels at attacking enemy cities.