Answer:
The proper style for an argumentative essay is academic.
Step-by-step explanation:
This question is not complete, the complete version with its options to answer is this:
The proper style for an argumentative essay is
academic.
friendly.
informal.
personal.
The academic writing style has some specific characteristics such as being formal, objective and technical, it does not use casual or conversational language, contractions or informal vocabulary or slang, it focuses on facts and ideas instead of how do people feel or what do they think about ant topic.