The correct answer is 4. Pidgin because a pidgin is a simplified language that develops as a means of communication between groups that do not share a common language. Here’s how each option fits into this context:
Creole: A creole is a fully developed language that evolves from a pidgin when it becomes the native language of a community. It typically results from prolonged contact between different linguistic groups.
Dialect: A dialect is a regional or social variation of a language with differences in vocabulary, grammar, or pronunciation, but it is usually mutually intelligible with other dialects of the same language.
Colloquial: Refers to informal or conversational language use within a language, not a separate language system.
Pidgin: A pidgin is a simplified language that arises when speakers of different native languages need to communicate for trade or other interactions but do not share a common language. Pidgins are not native to any group and are used as a bridge language.
Since the question asks for the language that arises from the contact of two mutually unintelligible languages, the correct answer is pidgin.