Concept:The pattern is that each first number is reduced by 43 to get the second number.Explanation:For 5077 and 5034: 5077 − 43 = 5034.For 3323 and 3280: 3323 − 43 = 3280.Apply the same operation to 1558: 1558 − 43 = 1515.Answer:1515 (Option C)