One of these is a regional language of the Omani Empire?

Arabic is a regional language of the Omani Empire. The Omani Empire was a powerful Islamic state that controlled vast territories across the Middle East, East Africa, and South Asia from the 17th to the 19th century. Arabic is the official language of Oman and has been spoken in the region for centuries, making it a regional language of the Omani Empire. The Arabic language played a significant role in the spread of Islam and the development of Islamic civilization, which was an important aspect of the Omani Empire. Today, Arabic is still widely spoken in Oman and is an important part of the country's cultural heritage and national identity.