AD is the answer i believe
<u>Answer:</u>
The correct answer option is 'then'.
<u>Step-by-step explanation:</u>
The "to prove" part of the information is the 'then' of the "if-then" statement.
For example, we have this problem:

If
, then find the value of y.
Here in this problem, we are asked that 'if' the value of x is true then prove it by substituting in the value.
#1. About 15.
5x3
#2. About 9
26/3=8 2/3
multiply 2x3xx3x4 and you get 72
so the answer would be :B