45. According to McDonald’s study, which of the following factors plays a more prominent role:“onset age of learning the L2” or “amount of exposure”?
(A) They exerted comparable and significant effects on L2 learners’ learning outcomes.
(B) The age factor played a more prominent role in determining learners’ attainment.
(C) The exposure factor seemed to be able to override the effect imposed by the age factor.
(D) No conclusion can be made based on the findings of the study.
(E) Both factors were insignificant and negligible.