The correct answer is option 1: Bhat. The currency of Thailand is called the Thai Baht, often referred to as simply the Baht. It is the official currency of Thailand and is denoted by the symbol [REPLACEMENT]. The Baht is subdivided into 100 satangs, but these subdivisions are rarely used anymore. It is important to note that options 2, 3, and 4 are incorrect. Option 2, Rupiah, is the currency of Indonesia. Option 3, Yuan, is the currency of China. Option 4, Yen, is the currency of Japan. Therefore, the correct and only currency of Thailand is the Thai Baht.