Explanation:

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
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 (4) is the correct answer