A group of 3 inter-related numbers as (6, 10, 16) is given. By tracing the relationship among the numbers in this group, choose another group with a similar relationship, from the given alternatives:

Logic: 2nd - 1st = 4 and 3rd - 2nd = 6.
Original group: (6, 10, 16)
2nd - 1st = 10 - 6 = 4 
3rd - 2nd = 16 - 10 = 6 
Now check each option with the same logic:
A. (9, 13, 18)
13 - 9 = 4 
18 - 13 = 5 
B. (6, 11, 15)
11 - 6 = 5 
15 - 11 = 4 
C. (5, 10, 18)
10 - 5 = 5 
18 - 10 = 8 
D. (7, 11, 17)
11 - 7 = 4 
17 - 11 = 6 
Correct Answer: (D) (7, 11, 17)