Read the text The History of Ice Cream:

I scream, you scream, we all scream for ice cream! Who doesn't love a nice, cold scoop of ice cream on a warm day? For thousands of years, ice cream has been a decadent dessert loved by most people around the world.

There is some argument about who first invented ice cream. Some believe that ice cream was invented by the Chinese people anywhere from 2,000 to 6,000 years ago. They created a recipe of frozen milk and rice that was served as a dessert. Persia has also been credited with first serving frozen desserts. Over 2,000 years ago, the wealthy people of Persia enjoyed shaved ice from the mountains, covered with grape juice. They later learned to freeze rosewater and add different fruit toppings. These desserts were considered delicacies that only the richest families could experience. About 1,000 years after this, there is evidence that suggested Nero, the Roman Emperor, also enjoyed frozen treats and demanded that a constant supply of ice from the mountains be available to him. He liked to add honey to the top of his dessert.

Ice cream as we know it can be traced back to the 9th century in Arab cities, such as Baghdad, Damascus, and Cairo. Near the end of the 13th century, Marco Polo returned to Italy after his travels through China with news of a frozen creamed dessert. In Europe, ice cream could only be found in Italy. Then, in 1533, Italian noblewoman Catherine de'Medici of Italy married Henry II of France. As Queen, Catherine introduced ice cream to France. Soon, the popularity of the dessert spread across all of Europe.

Why is there an argument about who really invented ice cream?

a: Ice cream wasn't created until the ice cream cone was invented.
b: Many people around the world disagreed about which flavor of ice cream would be recognized as the first.
c: Only wealthy people were given credit for inventing ice cream.
d:There were many people from different places experimenting with frozen desserts around the same time.