Water pipes in hilly areas often burst on a cold frosty night because (a)the material of which pipes are made contracts due to cold and so breaks (b)water in the pipes freezes and on freezing water expands so pipes break (c)frost makes the pipes rusty so they break (d)None of these
option B. Water pipes burst due to the fact the water inner them expands is it receives near freezing, and this reasons an boom in strain within the pipe.
