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

These numbers have been listed here: 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.