We will then plug our values for x, m, and h into the remaining answer choices.

我们将把 x，m 和 h 的值代入剩下的答案选项中。

In which case we would need to go back and select new values for x, m, and h.

在这种情况下，我们需要为 x，m 和 h 选择新的值。

So, we now need to check each answer choice and see which one yields to be 12 yards when we plug in our values for x, m, and h.

所以我们现在需要检查每个答案，看看当我们代入 x，m，和 h 的值时哪个是 12 码。

Finally, when we get to answer choice D and plug in our chosen values for x, m, and h, we see that this expression does indeed evaluate to be 12 yards.

最后，当我们选 D，代入 x，m，和 h 的值时，我们看到这个表达式的值确实是 12 码。