The correct option is C A- t, B- s, C- r, D- q
Each osteon consists of concentric layers of compact bone tissue, that surround a central canal called the Haversian canal. So, option 'A' matches with option 't'. Dendrites are the short cytoplasmic processes of the cell body of the neuron, which receives stimulus from other neurons. So, option 'B' matches with option 's'. Sarcolemma is the cell membrane of a striated muscle fiber. So, option 'C' matches with option 'r'. Chondrocytes are the only cells in healthy cartilage. So, option 'D' matches with option 'q'.
Thus, the correct answer is the option (C), 'A t, B s, C r, D q'.