Concept:The underlined ch in "chunk" is pronounced as /tʃ/.Explanation:In "choir", the ch sounds like /k/, so option A is wrong.In "chemise", the ch sounds like /ʃ/, so option B is wrong.In "matches", the ch appears as /tʃ/, exactly like the sound in "chunk".In "show", the sh sounds like /ʃ/, not /tʃ/, so option D is wrong.Therefore, the word with the same consonant sound is "matches".Answer:C. matches