Arrange the given sentences in the most logical order to construct a coherent paragraph and choose the correct combination.
A. When he saw physically challenged children playing wearing the new calipers, his eyes were filled with tears of joy.
B. Abdul Kalam loved children and spent most of his leisure time helping them.
C. Once he was requested to make a caliper for disabled children using light metal.
D. His team designed calipers using very light material which is used in making missiles.