A bimetallic strip consists of brass and iron. When it is heated it bends into an arc with brass on the convex and iron on the concave side of the arc. This happens because

• A.  brass has a higher specific heat capacity than iron
• B.  density of brass is more than that of iron
• C.  it is easier to bend an iron strip than a brass strip of the same size
• D.  brass has a higher coefficient of linear expansion than iron