Answer:
Equation
shows way to take apart 9.
Explanation:
Taking apart means subtracting that quantity or group from a given quantity or group.
Now let us look our given options one by one.
A.

We can see that in this equation we are subtracting 9 from 10. Therefore, this is a correct option.
B.

In this equation 1 is being subtracted so 1 is taken apart instead of 9. Therefore, this option is wrong.
C.

In this equation we are adding 9 instead of subtracting 9. Therefore, this option is also wrong.
D.

In this equation 1 is being subtracted or taken apart from 9. Therefore, this option is wrong.