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# If the equation $y=A \cos (Bx-Ct)$ describe the motion of objects ( where $x$ and $y$ are displacements, $t$ is time ), what must be the units of variables $A,B$ and $C$ ?

$(a)\;m,m^{-1},sec^{-1}\quad (b)\;m^{-1},m,sec\quad (c)\;m^{2},m,sec^{-1}\quad (d)\;m^2,m^{-1},sec^{-1}$

$y=A \cos (Bx-Ct)$
$(meters)=A \; as\; (B(meters)-c\;seconds)$
$(meters)=(meters)\;as\;[(unitless)-(unitless)]$