Name the strait that separates Tasmania from mainland Australia.

Bass Strait is indeed the body of water that separates Tasmania from mainland Australia. This strait is approximately 240 kilometers (150 miles) wide at its narrowest point and is an important geographical feature in the region. It serves as a natural boundary between the island state of Tasmania and the Australian mainland, playing a significant role in marine navigation and ecology. The strait is also known for its strong currents and diverse marine life, which include a variety of fish and unique underwater ecosystems.

Understanding the geographical significance of the Bass Strait helps to appreciate its role in Australian history and culture, as it has influenced trade, transportation, and even migration patterns between Tasmania and the mainland. The other options mentioned refer to larger bodies of water or different geographical features that do not specifically separate Tasmania from Australia, which further emphasizes the unique position of the Bass Strait.