If the water molecule is linear it would have a very high boiling point it would be highly reactive its dipole moment would be zero it would be highly ionic
option B AND D are correct Water' bent structure leads to its polar nature, which is the cause for most of its unique properties. It the molecule were straight, it would not be polar and this would be quite disruptive. Water would no longer be strongly attracted to itself or other polar molecules. So water would no longer have surface tension. Insects which walk on water would fall through.
