What is the missing number in the sequence?

198
The relationship in the first figure: - 101 - 38 = 63, 43 - 15 = 28
- The sum is 63 and 28, which yields 91.
In the second figure, 48 - 56 = 8, 34 - 184 = -150.
- Hence, the missing number is 142.
Which letter replaces the question mark? A, D, G, J, M, ?