 
 <translate> The question is: 80 370 860 1550 2440 ?
Options:
(A) 900
(B) 840
(C) 750
(D) 860
(E) 3530
Step-by-step reasoning process: 10^2 - 20 = 80
20^2 - 30 = 370
30^2 - 40 = 860
40^2 - 50 = 1550
50^2 - 60 = 2440
60^2 - 70 = 3530.
 <ibo> Ajụjụ bụ: 80 370 860 1550 2440? Nhọrọ: (A) 900 (B) 840 (C) 750 (D) 860 (E) 3530 Ntụgharị uche site n'otu nzọụkwụ gaa n'ọzọ: 10^2 - 20 = 80 20^2 - 30 = 370 30^2 - 40 = 860 40^2 - 50 = 1550 50^2 - 60 = 2440 60^2 - 70 = 3530. 