A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown. Two overlapping circles are shown. On top of the left-hand circle Ionic Bond is written and on top of the right-hand circle Covalent bond is written. The non-overlapping space on the left is marked A, the overlapping space is marked B and the non-overlapping space on the right is marked C.

Which of the following characteristics can be written only in space B?

Occurs in substances that have at least one non-metal
Occurs in substances that have a repeating lattice structure
Occurs in substances that have discrete molecular structure
Occurs in substances that have high melting points