请选择DCBA4k4x8n:g.{3N*x+G2[-J9h)@Birds —— when there isn’t enough food for them．8P7X(q2j4_/z'P
A． starve8P7X(q2j4_/z'P
B．are starving8P7X(q2j4_/z'P
C．starved8P7X(q2j4_/z'P
D．starves8P7X(q2j4_/z'P