The correct option is B 15498
Given numbers are 15489, 15496, 15474 and 15498.
In these, the digits in ten thousands, thousands and hundreds places are all equal.
So, we compare the digits in tens place.
∵9>8>7
15498 and 15496 are greater than 15489 and 15474.
Now, to find the greatest among 15498 and 15496, we compare the digits in units place.
∵8>6
15498 > 15496
Hence, 15498 is the greatest among the given numbers.