Iron is a metal. The structure of iron is described as a lattice of positive ions in a sea of electrons. Which of the following statements about iron are correct?
1 iron conducts electricity because the electrons are free to move
2 iron has a high melting point due to the strong covalent bonds
3 iron is an alloy
4 iron is malleable because the layers of atoms can slide over one another
A. 1 only

B. 1 and 3
C. 1 and 4
D. 2, 3 and 4