Which of the following molecule has maximum number of $90°$ bond angle?

The molecule has maximum number of $90°$ bond angle is ${\mathrm{SF}}_6$.

The geometry is bipyramidal square. Due to the octahedral structure of ${\mathrm{SF}}_6$, there are six $90°$bond angles between fluorine and Sulphur, as well as $90°$ angles between each fluorine and its four closest neighbors and a $180°$ angle between each fluorine and its opposing fluorine.