Jake is a high school student. After-school conversations with friends include the use of slang words and may include telling of a "dirty joke." When Jake arrives at his grandparents' house he uses standard English and says "ma'am" and "sir" when addressing them. This ability to adjust language represents skill in ________.
(a)-pragmatics
(b)- basic communication skills
(c)- Learning Skill
(d)- None of these