A. 30 B. 36 C. 39 D. 49 The series progresses by adding consecutive odd numbers to the previous number: 4 + 3 = 7 7 + 5 = 12 12 + 7 = 19 19 + 9 = 28 Following this pattern, the next number in the series should be obtained by adding 11 to the previous number: 28 + 11 = 39 So, the correct answer is option C. 39.