Select the option that can be used as a one-word substitute for the given group of words.
A person who likes to argue about anything

The correct option is Contentious.

Let's break down the meaning of the given options to understand why "Contentious" is the correct one-word substitute for "A person who likes to argue about anything":

1. Contentious: This adjective describes someone who is prone to arguing, causing, or being involved in heated debates and disputes. Therefore, a person who likes to argue about anything is described as contentious.
2. Veracious: This means speaking or representing the truth; truthful or honest. It has no connection to arguing.
3. Reticent: This refers to a person who is reserved, quiet, or not revealing one's thoughts or feelings readily. This is the opposite of someone who actively seeks arguments.
4. Coward: This is a person who lacks the courage to do or endure dangerous or unpleasant things. It is unrelated to a habit of arguing.

Thus, the appropriate one-word substitute is Contentious.