文法G[]=({b},{N,B},N,{N→b│bB,B→bN}),该文法所描述的语言是____
A、L(G[N])={bi│i≥0}
B、L(G[N])={b2i│i≥0}
C、L(G[N])={b2i+1│i≥0}
D、L(G[N])={b2i+1│i≥1}