In following number series, two terms have been put within brackets. Choose the appropriate option - Look at this series: 58, 52, 46, 40, 34, . . .What number should come next ?

Answer: B. 28

This is a simple subtraction series.
Each number is 6 less than the previous number.
(58 - 6 = 52) (52 - 6 = 46) (46 - 6 = 40) (40 - 6 = 34)
(34 - 6 = 28)
So the answer is b = 28.