31. According to the passage, how has the percentage of children in OECD countries attending private schools changed from 2000 to 2018?
(A) It increased from about 8% to 15%.
(B) It remained steady at about 8%.
(C) It decreased from about 8% to 5%.
(D) It increased from about 5% to 8%.
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統計: A(0), B(0), C(1), D(0), E(0) #3443524
統計: A(0), B(0), C(1), D(0), E(0) #3443524