Passage Three There was a time in the early history of man when the days had no names! The reason was quite simple: Men had not invented the week. In those days, the only division of times was the month, and there were too many days in the month for each of them to have a separate name. But when men began to build cities they wanted to have ,a special day on which 10 trade, a market these market days were fixed at every tenth day, sometimes every seventh or every fifth day. The Babylonians decided that it should be every seventh this day they didn't work, but met for trade and religious festivals The Jews followed their example, but kept every seventh day for religious purposes, In this way, the week came into existence. It was the space between market days. The Jews gave each of the seven days a name, but it was really a number after the Sabbath day (which was Saturday), For example, Wednesday was called the fourth day (four days after Saturday, When the Egyptians adopted the seven-day week, they named the days after five planets the sun and the moon. The Romans used the Egyptian names for their days of the week: the day of the sun, of the moon, of the planet Mars, of Mercury, of Jupiter, of Venus, and of Saturn. While we get our names for the days not from the Romans but from the Anglo-Saxons, who called most of the days after their own gods, which were roughly the same as the gods of the Romans, A day, by the way, used to be counted as the space between sunrise and sunset. The Romans counted it as from midnight, and most modern nations use this method. In the early times there were no names for the days, because men___
选项：

A: had not yet created the idea of grouping seven days in a week
B: did not know how to spell "week"
C: considered unnecessary to have the names
D: did not believe it was the time to invent the week