Divisibility Rules

A number is divisible by 11 if the difference between the sums of digits in even places and the sum of digits in odd places is either 0 or divisible by 11.
In option (b), the digit in the even place is 9 and digits in odd places are 4 and 5.
And their difference is ( 4 + 5 ) - 9 = 0.
The difference is 0.
So, 594 is divisible by 11.
Therefore, option (b) is correct.