(1) The sum of point A and point B is located to the right of both A and B; this is True for all.
The sum of the coordinates of two points on a straight line would be coordinates for a longer line and hence would be moving towards the right side. Please remember that the number line in all cases is increasing towards the right and decreasing towards the left.
(2) The difference of point A and point B is located to the left of B and to the right of A. The position of the difference can be located in either direction because unlike addition, the difference of two numbers can be either A - B, or B - A. The result of both expressions cannot be the same (just as 8 - 3 does not yield the same result as 3 - 8). The difference can lie between both points (which is the left side of B or towards the left of point A). Hence this is not true for any
(3) If point C is drawn to the lef of point A, then point C > point B. The number line as explained earlier is decreasing towards the left hand direction, which means a point C drawn to the left of point A would not be greater than point B, but actually less than. Hence, this is not true for any
(4) If point D is drawn to the right of point B, then point A < point D. Since point D is moving in the right hand direction, then it simply means point A is less than point D (since A is already moving to the left side). So this is true for all.