Answer: The correct option is
(D) a translation of 3 units to the left.
Step-by-step explanation: Given that the point (m, n) is transformed by the rule (m−3, n).
We are to select the correct transformation that occurred.
We know that
if a point (a, b) is translated to (a-k, b), then it means that the point is translated k units to the left.
Since (m, n) is transformed by the rule (m−3, n), so it means that the point (m, n) is translated 3 units to the left.
Thus, the required transformation is
"a translation of 3 units to the left".
Thus, (A) is the correct option.