A language teacher firstly, asks students to introduce themselves to each other in the class. Then she asks them to introduce their friend to each other. This activity will help them to increase

The correct option is BICS.

Explanation:

1. Understanding BICS:
BICS stands for Basic Interpersonal Communicative Skills. This concept was developed by Jim Cummins to describe language skills used in everyday social interaction and informal communication. These skills are context-embedded and are typically acquired naturally through face-to-face conversations, casual interactions, and social play.

2. Analyzing the Classroom Activity:
In the given scenario, the teacher engages students in introductory activities (introducing themselves and introducing a friend to classmates). These types of activities involve social interaction, personal expression, and conversational language suitable for daily informal communication rather than academic, abstract reasoning.

3. Distinguishing from Other Concepts:
• CALP (Cognitive Academic Language Proficiency): Refers to formal academic learning, including reading, writing, and analyzing content-area subject matter in an academic context.
• PPPP / ELT: Refer to teaching methodologies or general domain acronyms (such as English Language Teaching) rather than the specific type of language proficiency being developed through social introduction tasks.

Therefore, the activity directly helps to increase the students' BICS (Basic Interpersonal Communicative Skills).