$\begin {array} {1 1} (A)\;A\: natural\: number\: is\: odd\: implies\: that\: its\: square\: is\: odd \\ (B)\;A\: natural\: number\: is\: odd \: only \: if\: its\: square\: is \: odd \\ (C)\;If \: the \: square\: of\: a\: natural\: number \: is \: not\: odd,\: then\: the \:natural \: number\: is \: also\: not\: odd \\ (D)\;For\: a \: natural\: number\: to \: be \: odd,\: it \: isn’t\: necessary\: for\: its\: square\: to \: be\: odd \end {array}$