A Clauses I and II are consistent with the findings of the original research. Clause II is subordinate to clause I, but the phrase "brought about" should be replaced by "bring up."
B Clauses I and II are grammatically correct and consistent with the findings of the original research. Clause I is coordinated with clause II.
C Clauses I and II are grammatically correct and consistent with the findings of the original research. Clause II is subordinate to clause I.
D Clauses I and II are consistent with the findings of the original research. Clause II is subordinate to clause I, but the phrasal verb "brought about" is used incorrectly.
E Clause I cannot be connected with Clause II, but they are both grammatically correct.