新闻的第一句话提到， 由于隐私泄露隐患， 欧洲委员会召回了一款为儿童设计的职能手表， 由此可知手表被召回的原因是“a serious privacy risk”。 故选A。

【录音原文】
The European Commission has ordered a recall of a smartwatch for children because of what is called a “serious” privacy risk. The watch, called Safe-KID-One, is a product of the German electronics manufacturer Enox. The company sells other smartwatch models, as well as televisions and wireless communication devices. On its website, Enox describes the Safe-KID-One as a tool for parents. The watches have a simple, colourful design that seems appealing to children. The device has a built-in microphone and speaker to permit two-way communication.