已知全集U＝{0,1,2,3,4,5,6,7,8,9}，集合A＝{0,1,3,5,8}，集合B＝{2,4,5,6,8}，则（∁_UA）∩（∁_UB）等于 （ ）．
A．{5,8}     B．{7,9}        C．{0,1,3}     D．{2,4,6}