The correct answer is D
2807, 1400, 697, 346, 171, 84, 41, ?
78, 88, 100, 114, ?, 148
257, 399, 566, ?, 983, 1237
84, 97, ?, 162, 214, 279
625, 125, 375, 75, 225, 45, ?
18, 30, 54, 90, 138, ?
32, 42, 62, 92, ?, 182
321, 240, ?, 105, 51, 6
120, 130, 145, 165, ?, 220
81, 41, 42, 64.5, ?, 330