Concept:Language assessment checks how well a learner can use the language in real-life situations. It focuses on overall ability, not just comparison with others.Explanation:Language is a tool for communication. Assessment collects data to improve learning. Language assessment measures a learner's proficiency – the ability to use language skills accurately and appropriately. It tests vocabulary, grammar, and fluency in daily contexts. It does not compare learners to peers or measure only summative achievement. Instead, it evaluates how effectively a learner can communicate.Answer:D. the language proficiency of learners.