Which of the following is a statement?

Question

$\begin {array} {1 1} (A)\;Mathematics\: is \: interesting \\ (B)\;How\: far\: is\: Delhi\: from\: here? \\ (C)\;The \: sum \: of \: 3\: and\: 8 \: is\: greater\: than\: 11 \\ (D)\;Square \: of \: a \: number\: is\: an\: even\: number \end {array}$