______ have the option to exercise the option.A．Only option sellersB．Only option buyersC．Both the option sellers and buyersD．Only the exchanges

正确答案：B
解析：文章第一段提到Only option buyers have the choice to exercise an option．只有期权的买方可以选择以何种方式处理期权合约，即只有买方愿意执行期权时，卖方才能执行期权。