Concept:The underlined letter s in "disease" is judged by its actual consonant sound, not by its spelling.Explanation:The word "disease" is pronounced /dı’zi:z/.The underlined s has the voiced consonant sound /z/.Now compare this sound with each option.A. "decease" is pronounced /di’si:s/ — it has the sound /s/, not /z/.B. "case" is pronounced /keIs/ — it ends with /s/.C. "seats" is pronounced /si:ts/ — it contains /s/ and /ts/.D. "zeal" is pronounced /zi:l/ — it begins with the voiced sound /z/.Therefore, the word that shares the same consonant sound is "zeal".Answer:D. zeal