21. How many of the following reaction sequences can properly achieve the transformation below?
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 (I) (i) CH3COCI/AICI3； (ii) HNO2/H2SO4；(iii) CH3MgBr； (iv) H3O+/heat
 (Ⅱ) (i) CH3COC/AICl3； (ii) CH3MgBr, Et2O； (ii) H3O+/heat, (iv) HNO3/H2 SO4
(Ⅲ) (i) CH3COCV/AICI3； (ii) HNO3/H2SO4； (ili) CH2-PPh3
(A)0
(B)1
(C)2
(D)3

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