An iron strip and a brass strip are joined securely together for their full length. This paired arrangement is called a bimetallic strip. The bimetallic strip is heated, and it curves as shown. It is then cooled and returns to being straight. What makes the bimetallic strip become straight again?
- AThe brass contracts more than the iron.
- BThe brass expands more than the iron.
- CThe iron contracts more than the brass.
- DThe iron expands more than the brass.