Q. The bimetallic strip in a thermostat consists of brass and iron. When the strip is heated, it bends into an arc with brass on the convex side and iron on the concave side of the arc. This happens because

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