Language teaching refers to a process whereby a child gains communicative comprehension or fluency over a language. It involves practice by learners where facilitation is provided by a teacher.Different theories about the nature of language and how languages are learnt (the approach) imply different ways of teaching language (the method), and different methods make use of different kinds of classroom activity (techniques).A strategy refers to any means or tools used by the teacher to promote stimulate or motivate learning. It is defined as a plan deployed at each level of learning for the attainment of objectives and the realization of long-term goals of learning.A technique is a specific way of conducting instructional activities with the purpose to keep students involved. It refers to the design and procedure components of a method. It may be described as an implementational sub-process of a method. A method is a way of teaching a language based on systematic principles and procedures. It is an overall plan for the orderly presentation of language material, no part of which contradicts and all of which is based on the selected approach.An approach is a set of correlative assumptions dealing with the nature of language teaching and learning. An approach is axiomatic. It describes the nature of the subject matter to be taught.Hence, it is clear that A - d, B - c, C - b, D - a is correct in the context of the question.