Which of the following statements is true?

Question

$\begin {array} {1 1} (A)\;Each\: radius\: of \: a \: circle\: is\: a \: chord\: of\: the\: circle \\ (B)\;The\: centre\: of\: a\: circle\: bisects \: each\: chord\: of\: the \: circle \\ (C)\; \sqrt {11}\: is \: a\: rational\: number \\ (D)\;If\: x \: and\: y\: are\: integers\: such\: that\: x>y,\: then\: -x < -y \end {array}$