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 is prepared best by the reaction

A.

`(CH_3)_3C-Br+CH_3OK->`

B.

`(CH_3)_3C-OH underset{170^oC}{stackrel{H_2SO_4}{rightarrow}`

C.

`(CH_3)_3COK+CH_3-Br->`

D.

`(CH_3)_2C=CH_2overset{Conc. H_2SO_4}{rightarrow}`