Which one of the following countries does not have a border with China ?

China shares land borders with 14 sovereign nations, making it one of the countries with the highest number of neighbors in the world [t2, t5]. To its west and northwest, China borders Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, and Pakistan [t4, t8]. Specifically, the border with Afghanistan is approximately 47 miles long, located at the end of the Wakhan Corridor [t1]. To its south and southeast, China shares boundaries with Myanmar (formerly Burma), Laos, Vietnam, India, Nepal, and Bhutan [t1, t4]. Myanmar shares a significant border of about 1,357 miles with China [t1]. While Thailand is located in Southeast Asia and is relatively close to China's southern Yunnan province, it is separated from China by the territories of Myanmar and Laos [t1, t4]. Therefore, Thailand does not share a direct land border with China.