Which situation is an example of people using a lingua franca?

A Spanish speaker and a French speaker conduct a business transaction in English
A Spanish speaker speaks Spanglish to conduct a business transaction in English
A Spanish speaker brings a translator when conducting a business transaction in English.
A Spanish speaker and a French speaker use sign language to conduct a business transaction.
A Spanish speaker and a French speaker conduct a business transaction in US dollars.

A lingua franca (pronounced LING-wa FRAN-ka) is a language or mixture of languages used as a medium of communication by people whose native languages are different. It is from the Italian, "language" + "Frankish" and also known as a trade language, contact language, international language, and global language.

The term English as a lingua franca (ELF) refers to the teaching, learning, and use of the English language as a common means of communication for speakers of different native languages.

Explanation:

it sounds like either a or c