则方程的根的个数为( )\n \n \n \n \n \n \n

\n \n \n \n A.\n 0\n

\n \n

\n \n \n \n B.\n 1\n

\n \n

\n \n \n \n C.\n 2\n

\n \n

\n \n \n \n D.\n 3\n