47. According to paragraph 7, why would a 10-year-old be unable to solve algebra problems?
(A) Algebra requires concrete operational thinking.
(B) A 10-year-old has not reached the formal operational stage.
(C) A child of 10 does not have logical reasoning abilities.
(D) An algebra problem has too many steps in order to solve it.

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統計: A(7), B(20), C(7), D(4), E(0) #1184352