What is meant by oxidation plz explain and don't spam​

Originally, the term oxidation was used to describe reactions where an element combines with oxygen. For example, the oxidation of magnesium involves the chemical reaction between magnesium metal and oxygen to form magnesium oxide. The word reduction comes from the “to lead back” sense of the Latin stem.

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.