Read the sentence and answer the question.
From what we can discern today, both the ancient Egyptians and the Mesopotamians (or Babylonians) focused on specific practical problems; the idea of stating and proving general theorems does not seem to arise in either civilization.
Which of the following changes should be made to the sentence?
A
Change "can" to "could"
B
Change "focused" to "focusing"
C
Change "stating and proving" to "stated and proved"