16. (5%) Find the dimension of the subspace
(A) 2
(B) 3
(C) 4
(D) 1
(E) 0
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統計: A(0), B(1), C(0), D(0), E(0) #2853918
統計: A(0), B(1), C(0), D(0), E(0) #2853918