What type of bonding does a material most likely have if it has a low melting point, does not dissolve
in water and has a dull appearance?

Covalent type of bonding does a material most likely  have if it has a low melting point, does not dissolve  in water and has a dull appearance.

Explanation:

A covalent bond is a bond formed by sharing of electrons between the combing atoms. The bond through with these atoms are combined is called covalent bonding.

Some characteristics of non-metals are as follows.

Covalent compounds have low melting point.

Being non-polar in nature covalent compounds do not dissolve in water.

They are brittle in nature.

Thus, covalent type of bonding does a material most likely  have if it has a low melting point, does not dissolve  in water and has a dull appearance.

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explanation:

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.