Which excerpt from chesterton's essay best expresses what st. thomas aquinas taught about modification?
a. st. thomas maintains that the ordinary thing at any moment is something; but it is not everything that it could be."
b. "things change because they are not complete; but their reality can only be explained as part of something that is complete. it is god."
c. "we have seen that most philosophers simply fail to philosophise about things because they change; they also fail to philosophise about things because they differ."
d. "to sum up; the reality of things, the mutability of things, the diversity of things, and all other such things that can be attributed to things, is followed carefully by the medieval philosopher, without losing touch with the original point of the reality.