Read the passage and then choose the best answer to the question. Answer the question based on what is stated or implied in the passage.
Many people have owned, or have heard of, traditional “piggy banks,” coin banks shaped like pigs. A logical theory about how this tradition started might be that because pigs often symbolize greed, the object is to “fatten” one’s piggy bank with as much money as possible.
However, while this idea makes sense, it is not the correct origin of the term. The genesis of the piggy bank is the old English word “pygg,” which was a common kind of clay hundreds of years ago in England. People used pots and jars made out of this red “pygg” clay for many different purposes in their homes. Sometimes they kept their money in one of the pots, and this was known as a pygg bank. Over the years, because “pygg” and “pig” sounded the same, glaziers began making novelty banks out of pottery in the shape of a pig as a kind of joke. These banks were given as gifts and exported to countries where people spoke other languages and where no one had ever heard of pygg clay. The tradition caught on all over the world, and today piggy banks come in all colors and are made of all kinds of materials, including plastic.
This passage is mainly about how __________.
