In each of the following question, a series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. 120, 440, 960, 1680, ?

Analyzing the pattern: 120 = 1×120, 440 = 4×110, 960 = 8×120, 1680 = 12×140. The second factors are: 120, 110, 120, 140. The differences are: -10, +10, +20. Following this pattern, next difference would be +30, giving 170. First factors: 1, 4, 8, 12 are increasing by 3, 4, 4, so next increase by 4 gives 16. So 5th term = 16 × 170 = 2720, which isn't an option. Let me try another approach: 120 + 320 = 440, 440 + 520 = 960, 960 + 720 = 1680. The additions are 320, 520, 720 (increasing by 200 each time). Next addition would be 920, so 1680 + 920 = 2600. This matches option A.