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Explanation:

The highest possible value of the ratio of a four-digit number and the sum of its four digits is

Let the number be 'abcd' = 1000a + 100b + 10c + d

We have to find the highest possible value of 
(1000a + 100b + 10c + d) : (a + b + c + d)

This is possible when a is highest and b, c and d are lowest
i.e., a = 9 and b = c = d = 0

∴ Highest possible ratio = 9000 : 9 = 1000

Hence, option (a).