Integers are listed from 700 to 1000. In how many integers is the sum of the digits 10?

Here we have to find out all the integers between 700 to 1000, in which sum of the digits is 10, e.g. 703 ⟶ 7 + 0 + 3 = 10

Starting digits can be 7, 8 or 9 and require other digit sums to be 3, 2 and 1 respectively

These numbers have been listed below:
703, 712, 721, 730, 802, 811, 820, 901 and 910

Hence, there are 9 such integers in which the sum of the digits is 10.

Hence, option (d) is the correct answer.