Choose the word that has the underlined part pronounced differently from that of the others: mapSbookSbagScatS
Rule 1: Pronounce /s/ when ending in -p, -k, -t, -f. …
Rule 2: Pronounce /iz/ when it ends in -s,-ss,-ch,-sh,-x,-z,-o,-ge,-ce. …
Rule 3: Pronounce /z/ for the rest of the words.
Answer C is pronounced /z/; The rest of the answers are pronounced /s/.