Match List-I (Compounds ) with their most appropriate mechanism (List-II).
`{:("Column I","Column II"),((A)CH_3-undersetunderset(Cl)(|)CH-CH_2-CH=Ounderset(Delta)overset(OH^(-))to,(p)E2),((B)CH_3-CH_2-Ioverset(OH^(-))to,(q)E1cB),(( C)Me-undersetunderset(Me)(|)oversetoverset(Me)(|)C-Clunderset(Delta)overset(CH_3ONa)to ,(r)S_N2),((D)CH_3-CH_2-CH_2-O-Phoverset(Conc.HI)to,(s)"Intermediate carbanion"),(,(t)"D-exchange in presence of" OD^(-)//D_2O):}`

Answer

A-q,s,t ; B-r ; C-p,s,t ; D-q,s,t