单选题：请根据下面短文回答第题： In 1870s rich people began to speak of spending

请根据下面短文回答第题：
In 1870s rich people began to speak of spending weekends in the country visiting friends．Formost people back then, however, the workday was six days long．
Car maker Henry Ford was the first person in the United States to start a workweek of 5 days．
He did that in 1926．By 1940 it had become common for most Americans to work 8 hours a day, 5days a week．For many people Saturday night is the happiest time of the weekend and the week．
Anything and everything can happen(发生) on Saturday night．People go dancing; they visitfriends and have parties．They drink much alcohol(酒精饮料)．They sleep, and watch television．
People do the same things on other nights of the week too, but they do them more often on Satur-day night．
On Saturday night cinemas sell more tickets．It is also the biggest night for places that sell al-coholic drinks．That is one reason why most fights and car accidents(事故) are on Saturday night．
Is there anything people do not like about the weekend? A study of 1,000 Americans foundthat half would gladly have a more day of free time．The only thing wrong with the weekend, theythink, is that it does not last longer．
In 1870s the workday was______days long． A．four
B．five
C．six