Concept:Language skills are divided into receptive skills (listening and reading) and productive skills (speaking and writing). Productive skills require the learner to actively create language output.Explanation:The four basic language skills are listening, speaking, reading, and writing. Listening and reading are receptive because they involve understanding without producing language. Speaking and writing are productive because they need the learner to generate language through speech or written text. For example, speaking delivers information orally, while writing uses symbols to communicate thoughts in a readable form. These skills measure a learner's ability to produce language effectively. The natural order of acquisition is listening, speaking, reading, then writing, with productive skills following receptive ones.Answer:C. speaking and writing