Choose the best topic sentence for the following paragraph: The Americans and the British not only speak the same language but also share a large number of social customs. For example, in both America and England, people shake hands when they meet each other for the first time. Also, most English men will open the door for a woman or offer their seats to a woman, and so will most Americans. Promptness is important both in England and in America.That is, if a dinner invitation is for 7 o’clock, the dinner guest either arrives close to that time or calls up to explain his delay.