Ionic compounds form
a) crystal structures.
b) molecular structures.
c) pure elements.
d) neutral elements.

Answer;

A) crystal structures.

Ionic compounds form crystal structures.

Explanation;

-Ionic compounds are types compounds that are made of ions,that is, cations and anions. The charged particles are formed when an atom gains or loses electrons.

-A cation is a positively charged ion formed when an atom loses electrons while an anion is a negatively charged ion that is formed when an atom gains electron(s).

-These ions in the ionic compounds such as sodium chloride are arranged in a lattice structure. It is this regular arrangement that results in the formation of a crystal.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.