Among the following the solid which contracts on heating is

It has been a general observation that material bodies whether solids or fluids change in dimension on heating. Heating a body is accompained by an increase in size of the body. This phenomenon is called thermal expansion(or)Because cast iron is anisotropic solid

A – metals expands on heating

 B – Iron is also a metal which expands on heating

 D – Aluminium is also a metals which expands on heating