Complete the series.
8, 20, 36,56, (………)

Correct option is D

given sequence:
8, 20, 36, 56, (……).
The differences between consecutive terms are:
20 - 8 = 12
36 - 20 = 16
56 - 36 = 20
The differences are increasing by 4: 12, 16, 20.
Following this pattern, the next difference should be 24.
So, the next term will be: 56 + 24 = 80.
Thus, the correct answer is: (d) 80.