भाषाशिक्षणस्य कौशलानि क्रमशः: श्रवणम्, भाषणम्, पठनम्, लेखनम्

उत्तर: (D) c,d,b,a — The correct sequence is c,d,b,a. This ordering follows the established chronological, quantitative, or logical progression of the given items.