Answer:
A.
Step-by-step explanation:
An ad hominem is a type of fallacy where the person attacks the character, motive, etc of the other person. The term ad hominem is a Latin word which means 'to the person.' It is also known as 'argumentum ad hominem.'
This type of fallacy or argument is used to counter attack other person's argument mostly by attacking the other person's character, motive, etc. This type of argument does not focus on the matter at hand but to attack other person's dignity.
From the given options, the correct one is option A. In this fallacy, the speaker is attacking the personal attribute of the other person by calling him/her 'crazy.'
So, the correct answer is option A.