Concept:Stress pattern refers to which syllable in a word is pronounced with the most emphasis.Explanation:The word "maintenance" has stress on the first syllable: MAIN-te-nance.The word "primary" has stress on the first syllable: PRI-ma-ry.The word "candidate" has stress on the first syllable: CAN-di-date.The word "enigma" has stress on the second syllable: e-NIG-ma.So, "enigma" does not follow the same first-syllable stress pattern as the other three words.Answer:C. enigma