The language that most commonly serves as a lingua franca is:
A. English
English is widely used as a common language for communication between speakers of different native languages. It is commonly used in international business, diplomacy, tourism, and academic settings. Many people around the world learn English as a second language to facilitate communication with others from diverse linguistic backgrounds.
While other languages like French, Chinese, and Thai are important in their respective regions, English has gained prominence as a global lingua franca due to historical factors, colonization, and the widespread influence of English-speaking countries like the United States and the United Kingdom.