Answer :
An element in an effective argument is logical support because if you are trying to make you're argument effective, you need logical support to help your argument. Hope this helps!
The correct answer is C. Logical support
Explanation:
In arguments, which refer to the support you use to prove an idea, the best resource to use is always logic or support based on real facts, evidence, and reasoning. This type of support is preferred over an emotional or an ethical appeal because by using logical support you can prove or disprove almost any statement by using reasoning. This also guarantees the argument if is valid and you can convince the audience about it. Therefore, considering logical support is essential to well-supported arguments, logical support is one of the elements in an effective argument.